Your brain is on them.
Not in the sweet, soft, thinking-of-you way. In the other way. The way where a thought of them arrives uninvited fourteen times before lunch. Where a memory from three months ago suddenly has new texture because you’ve replayed it so many times it feels like evidence. Where you reach for your phone not because you want to, but because your hands are moving before you notice, checking for something that isn’t there.
If you have lived this, you know that the word “love” barely covers it. There is love in here, somewhere. There is also something else, something more compulsive, something that is eating you whether or not the person in question even knows you exist.
You came looking for how to stop overthinking about someone you love. What you probably need first is a clearer picture of what is happening, because the strategy for loosening this kind of grip depends on what you’re actually gripping.
Why romantic thought is uniquely sticky
A crush or an intense love activates systems in the brain that are not subtle.
Helen Fisher and colleagues’ fMRI research on romantic love (Fisher, Aron, & Brown, 2005) found that early-stage intense romantic love activates the right ventral tegmental area and the caudate nucleus, dopamine-rich regions associated with reward and motivation. Romantic love, neurologically, shares circuitry with other reward-driven behaviours. The brain treats the beloved the way it treats things it is motivated to acquire.
This matters because it tells you why the thinking is so hard to stop. You are not dealing with ordinary rumination. You are dealing with rumination riding on top of a dopamine-driven motivation system that is doing exactly what it was evolved to do: keep your attention fixed on the target of pursuit.
Limerence, and why it feels like this
In 1979, the psychologist Dorothy Tennov coined a term for what you may actually be experiencing. She called it limerence, and she wrote a book about it after interviewing hundreds of people about their experiences of intense romantic infatuation.
Limerence, in Tennov’s framing, has a specific set of features:
- Intrusive thinking about the other person. Not wanting to think about them and doing it anyway, constantly.
- Acute sensitivity to signs of reciprocation or rejection. A small gesture becomes enormous. A brief silence becomes devastating.
- Idealization. The person’s flaws either disappear or become attractive features.
- Emotional dependency. Your mood follows what you think they are feeling.
- Feared rejection that doesn’t stop the feeling. Knowing it might not work doesn’t make it stop.
Tennov’s core insight was that limerence is not the same as healthy love. Healthy love coexists with calm, choice, and capacity to think about other things. Limerence takes over. It is closer to an addiction than a relationship, whether or not the relationship is real.
If what you are living with sounds more like Tennov’s limerence than ordinary love, be gentle with yourself. This is a recognized pattern. It is not a character flaw, and it is not just you being dramatic.
The loop of idealization and interpretation
When you cannot stop thinking about someone, two parallel processes tend to be running.
Idealization. You are mentally polishing them. Remembered moments get sharper and more beautiful. Their good qualities get magnified, their concerning ones minimized. This is not dishonesty. It is the way a brain on dopamine and attachment activation processes information about the target of its pursuit.
Interpretation. You are spending large amounts of cognitive energy trying to decode what they felt, what they are feeling now, what they will feel later. Every signal becomes data. A text that took an hour to arrive becomes evidence. The angle of their head in a photo becomes evidence. Nothing is neutral because your system has no neutral category for this person.
The loop runs because both processes feed attention back to the object. The more you idealize, the more important each signal becomes. The more you interpret, the more you find to idealize about a person capable of generating this many signals worth decoding.
Why “figuring them out” doesn’t work
The mind’s solution to obsessive thinking about a person is usually to think harder, on the theory that if you could just understand them fully, the thinking would settle.
It doesn’t work for two reasons.
First, you cannot understand another person through thinking about them. You can only understand them through interaction with them over time, and even then, much of their inner life will remain opaque. The thinking is not producing understanding. It is producing a more elaborate mental model that confuses itself for understanding.
Second, the thinking is not really aimed at understanding them. It is aimed at managing your own feelings about the uncertainty of the situation. If you could just know whether they felt what you feel, whether this was going to work, whether you should stay or go, you could relax. The thinking is trying to produce that relief. It cannot, because the certainty you are looking for is not available.
Redirecting attention, not suppressing feeling
You cannot make yourself stop feeling what you feel. Suppression makes it worse. Research on thought suppression consistently shows that trying not to think about something produces a rebound effect where you think about it more.
What you can do is slowly shift where your attention lives.
A few things that actually help:
- Reduce exposure to triggers. If you are still seeing their social media, you are feeding the loop. You do not need to permanently block them. You may need to mute, unfollow, or take a break for long enough that the neural pathways start to weaken.
- Move your body. Physical activity disrupts rumination more reliably than most cognitive interventions. A walk is not going to fix the feeling, but it will change the intensity of the thinking for long enough to notice that the thinking is not the whole of you.
- Fill the space they have been occupying. Obsession tends to crowd out other attachments, other pursuits, other sources of meaning. Rebuilding those is the long work. It is also what makes the loop loosen over months, even if it feels slow.
- Sit with the feeling without feeding it. There is a middle ground between indulging the obsession and suppressing the feeling. You can feel the ache without typing their name into anything. You can miss them without reviewing the shared photos. This is the hardest move and the most important one.
What you are actually longing for
This is the part people rarely say, and it is worth saying clearly.
When you cannot stop thinking about someone, what you are fixated on is rarely only the person. It is something the person represents: a version of yourself that you access only when you are with them, a feeling of being fully seen that you haven’t had elsewhere, a promise of belonging that the relationship seemed to offer.
The real longing is often underneath the longing for them. And when you find it, when you can see what you were actually reaching for, the grip on the specific person starts to loosen, because they were never the only possible vessel for that need.
This is not a quick move. It is the slow internal work that breakups and unrequited loves eventually ask of us, if we let them. The pain is doing something. What it is doing is showing you a shape of need that you can then start to meet in more durable ways.
When it is a current relationship versus an unavailable person
If you are overthinking someone you are actually with, overthinking in relationships covers the dynamic more specifically, and how to not overthink in a relationship gives practical moves.
If you are overthinking someone you are not with, whether that’s a crush, an ex, or someone unavailable, the work is different. The relationship you are obsessing about is largely happening inside your own head, and the way out is through the longer process above.
For the broader pattern of obsessive thinking, the general approach in how to stop overthinking applies here too. And if the break was recent and painful, how to stop overthinking after being cheated on may sit closer to where you are.
Before Sunset, and the gift of a conversation that ends
In Richard Linklater’s Before Sunset, Jesse and Céline walk through Paris for eighty minutes, nine years after a night that never left either of them. What is striking, watching it, is how much of their conversation is about the thinking they have been doing about each other all this time. The mental replaying. The what-ifs. The way one real evening became a lifetime of interior company.
They don’t come out of it with certainty. They come out of it with presence. The loop loosens not because they finally figured it out, but because they are finally, briefly, in contact with each other instead of with the idea of each other.
You may not get your version of that conversation. Most people don’t. But the instruction is still there: the loop breaks when the loop stops being the main relationship you have with them. The real person, even absent, is someone you can slowly release. The mental version is what keeps you trapped.
Feel what you feel. Don’t feed what you can’t afford to feed. And give yourself more time than you think this will take. It is doing real work, even while it hurts.
References
Bowlby, J. (1969). Attachment and loss, Vol. 1: Attachment. Basic Books.
Fisher, H., Aron, A., & Brown, L. L. (2005). Romantic love: An fMRI study of a neural mechanism for mate choice. Journal of Comparative Neurology, 493(1), 58–62.
Nolen-Hoeksema, S. (2000). The role of rumination in depressive disorders and mixed anxiety/depressive symptoms. Journal of Abnormal Psychology, 109(3), 504–511.
Tennov, D. (1979). Love and limerence: The experience of being in love. Stein and Day.