The Chemistry of the Beginning

The weather of the beginning

Almost everyone has lived through it: the first weeks of a connection that rearranges your attention without asking. You sleep less and mind it less. Songs are suddenly about this. Their texts get re-read; their small habits feel revelatory rather than ordinary. Energy comes from nowhere, appetite goes somewhere, and the rest of life takes on a faint, pleasant unreality. The polyamorous community gave this its working name — new relationship energy, or NRE — because in a life with more than one partner, you can watch it arrive and see exactly what it does to everyone around it.

That vantage point is the gift the term carries. NRE isn’t only a private thrill; it’s a force with a direction. It pulls focus toward the new and, left unattended, away from whoever was already there. Naming it lets you treat it as weather — something to dress for and plan around — rather than as the simple, total truth of how you now feel about your life.

Limerence: the obsessive cousin

NRE shades, at its most intense, into something psychology has its own word for. In her 1979 book Love and Limerence, the psychologist Dorothy Tennov coined limerence for the involuntary, near-obsessive state of being “in love” — built, she found, from three ingredients: intrusive thinking about the person, acute longing for them to feel the same, and a mood that rises and falls entirely on the smallest sign of their regard. Tennov reported that people deep in it could spend the majority of their waking hours thinking about the object of their affection.

Two features make limerence more than ordinary fondness. The first is uncertainty: it feeds on not-quite-knowing where you stand, and intermittent encouragement keeps it burning far longer than a settled, mutual love would. The second is crystallisation — a word the novelist Stendhal used two centuries ago for the mind’s habit of coating a beloved in imagined perfection, the way a bare twig left in a salt mine emerges encrusted with glittering crystals. Limerence doesn’t see the person clearly. It sees the version it has built.

What the brain is actually doing

The folk wisdom that you’re “high” on someone turns out to be close to literal. When the anthropologist Helen Fisher and her colleagues slid people who were intensely, recently in love into an fMRI scanner and showed them a photo of their beloved, the regions that lit up were not the soft glow of affection but the brain’s reward and motivation machinery — most notably the ventral tegmental area, a dopamine-rich hub that drives wanting, craving and goal pursuit. Aron, Fisher et al. (2005) argued that early romantic love behaves less like an emotion and more like a drive — a motivational engine, kin to hunger or thirst, aimed at one particular person.

There may be a second chemical signature too. A much-cited study by Donatella Marazziti found that people in the first months of love had blood markers of serotonin function as low as those of people with obsessive-compulsive disorder — a tidy biological echo of why the beginning can feel so wonderfully, helplessly fixated. The neuroscience here is young and still argued over, so hold the details lightly; what is well supported is the shape of it. The rush of the beginning is a reward-system event, and reward systems are built to chase, not to rest.

Why it cannot last (and shouldn’t)

Limerence is, by Tennov’s own account and most reckonings since, time-limited — typically running its hottest course over something like eighteen months to three years before it cools. That isn’t a flaw in your love; it’s the nature of the system. A brain held permanently in a dopamine-soaked state of craving and sleeplessness could not function. NRE burns brightest precisely because it is metabolically expensive, and bodies do not sustain expensive states.

What cools, though, is the rush — not necessarily the bond. Fisher’s later work found that some long-married couples who still reported being deeply in love showed activity in the same dopamine-rich reward regions as the newly smitten, alongside circuits tied to calm and attachment. The fade isn’t love ending. It’s love changing state — from the volatile chemistry of pursuit toward the steadier chemistry of attachment, the subject of its own field guide. Couples who expect the high to be the relationship tend to read this handover as a loss, and go looking for the next beginning rather than the deeper middle.

The judgement it quietly distorts

Crystallisation has a cost. While you’re inside the glittering version of someone, you are not a reliable narrator of who they actually are. The early rush dampens the ordinary alarms — it mutes incompatibilities, reframes red flags as quirks, and lends every shared moment a weight the relationship hasn’t yet earned. This is why the wise counsel against large, irreversible decisions in the first flush isn’t prudishness; it’s respect for a brain that is, briefly, chemically optimistic.

For anyone loving more than one person, the distortion has a sharper edge. NRE can make an established, beloved partner feel suddenly dull by comparison — not because anything has changed between you, but because novelty is loud and the familiar is quiet. Naming that as a chemical artefact, rather than a verdict, is half the work of moving through it kindly. The other half is remembering that the new person, too, will one day be familiar — and no less worth loving for it.

The beginning is also a business

There is a fact the brain chemistry sets up but this guide hasn’t yet named: the reward system that makes the beginning so compelling is also, now, a product. The dopamine machinery the scanner found — built to chase, not to rest — is exactly what the modern attention economy is engineered to hijack. Dating apps run on the same intermittent reward as a slot machine: the unpredictable ping of a new match delivers a small hit of precisely the wanting described above. And the incentives all point one way. A beginning is intensely monetisable — the subscriptions, the first dates, the new clothes, the flowers — while the long, quiet middle sells almost nothing. There is, in other words, a large industry with a structural interest in keeping you perpetually at the start, mistaking the next rush for the next love.

Which is why “feel it with your eyes open” needs more teeth than good intentions. The people with the sturdiest practices here are polyamorous, because they had no choice but to develop them — when new relationship energy arrives in a life that already holds a beloved, you can watch in real time as it tries to strip-mine the existing bond. Borrow their protocol, mono or not. Treat the rest of your life as a fixed budget the chemistry is not allowed to overspend: ring-fence existing partners, friends, sleep and work as non-negotiable, because NRE expands to fill whatever room you give it. Put a moratorium on big, irreversible decisions — moving, merging finances, a tattoo of a name — for the first year or so, while the brain is, by its own admission, chemically optimistic. And tell the new person plainly that you are in it — this is NRE, it’s real, and I know it distorts — which both protects them from your idealisation and reminds you that it is weather. The chemistry will spend your time, money and judgement freely if you let it. The protocol is simply to keep the books yourself.

How to ride it without wrecking anything

None of this is an argument against the high. The beginning is one of the great pleasures of being alive, and to refuse it out of caution is its own kind of poverty. The aim is only to feel it with your eyes open. A few honest habits help. Keep the rest of your life running — friends, work, sleep — so the new love is a room in the house, not the whole house. Make the big choices slowly, on a timeline the chemistry can’t rush. And if there are existing partners, say the obvious thing out loud: I’m flooded right now, it’s real, and I don’t want it to cost us.

Held that way, NRE becomes what it’s best at being — not a verdict on your whole life, not a reason to burn the old for the new, but a vivid, finite season worth savouring precisely because it ends. The goal isn’t to never get swept up. It’s to be honest while you are.

Threads to

When the rush quiets, read Desire & Domesticity on how longing survives the familiar, and Attachment, Grown Up on the steadier bond it hands off to. The forms where NRE matters most live in the Atlas — under polyamory, and in the long-distance flares of the comet. To turn the sting of a partner’s new spark into something workable, sit with the Compersion Coach; to keep knowing the person beneath the crystallised image, deepen your Love Map. If you’re standing at the start of opening a relationship, walk The Opening Door. The vocabulary lives in the Lexicon.

A drive aimed at one person, not at sex

The shorthand for NRE treats it as heightened desire — a flood of libido for a specific person that eventually settles into the steadier baseline of established love. Helen Fisher, Arthur Aron, and Lucy Brown’s 2005 fMRI study of people in early-stage romantic love complicates that picture precisely. What they found in the brain was not activation in areas associated with the sex drive — the hypothalamus and orbitofrontal cortex — but activation in the right ventral tegmental area and right caudate nucleus: reward and motivation circuitry, strongly lateralised to the right hemisphere, published in the Journal of Comparative Neurology. What NRE produces neurologically is not heightened sexual desire but a goal-directed wanting aimed at one specific person.

The distinction matters. A sex drive is diffuse — it orients toward a category of stimuli and is satisfied by members of that category. A goal-directed motivational drive focused on one person is different: it reorganises goal-priority around that target and sustains itself even in the target’s absence. This is why NRE can persist in long-distance relationships where sex is infrequent, and why it attaches to people with whom no sexual contact has occurred. It is also why NRE is economically dangerous in ways a simple libidinal surge is not: a goal-directed drive re-ranks one person as the highest-priority objective in every domain simultaneously — time, money, housing, career geography — and does so while generating internally coherent-sounding justifications for decisions the wanting is driving.

The practical implication of the Fisher et al. finding is that the classic NRE protocol — freeze major decisions until the intensity diminishes — is not about suppressing desire. It is about compensating for a temporarily hijacked goal-setting architecture. The brain has re-ranked one person above all competing objectives, and every decision made from within that hierarchy is downstream of the re-ranking. Waiting for the motivational circuitry to return to baseline typically takes between twelve and twenty-four months from the peak of activation — and the freeze is not a restriction on the relationship but a protection of the life into which that relationship will eventually need to fit.