I listened to an episode Live Well Be Well with Sarah Ann Macklin – interview with the Cambridge neuroscientist Hannah Critchlow – and part of it stopped me. Not because he told me something I didn’t know, but because he very accurately reported something I was watching people without being able to explain. Including myself at several points.
It was about breakups. And the part why you leave someone doesn’t mean you stop.
There is a special experience that almost everyone who has ended a relationship knows, and that almost no one talks about freely. You were the one who left. You made the decision. He had his reasons and they were real, and on some level he still believes they were right. And yet here she is three months later, checking their Instagram at eleven o’clock at night for no reason that she can honestly defend. I’ll see if they look good. I’ll check if they’re good. He just looks.
The standard story we tell about this is a moral. We pathologize it. We call it weakness or mixed feelings or proof that we didn’t really want to go. What Critchlow describes is structurally more interesting than these, and considerably less flattering to the narrative of an orderly, decisive exit.
The brain does not process the “end”, but is open
Critchlow relies on a concept developed by a psychologist Daniel Wegner called it transactive memory. The idea is that cognition in all long-term relationships is not entirely individual. The two people share a common cognitive system – a distributed memory and processing network on both of them. One person remembers the community calendar. The other holds the emotional map of the group of friends. Man navigates practical logistics. The other carries the history of the family. This division is not always conscious or agreed upon. Over time, it just happens as an emerging feature of two people’s lives together.
When a relationship ends, it’s not just the person who loses. You lose the other half of the cognitive system that you have been operating for months or years. Entire categories of information—things that we would have processed together, checked with each other, delegated to the other—suddenly have nowhere to go. The brain, which was operating at full capacity in part because it was offloaded to an external node, now has to reclaim all the processing itself. While trying to reconfigure everything else.
Critchlow’s term for this: losing an external hard drive.
This is why post-breakup exhaustion—even mutual, even right—can seem wildly disproportionate to what those around you think it should be. Not dramatic. It’s not you who can’t hold it together. It’s a brain that rebuilds an entire operating system while still asking you to run everything on it.
Why keep looking
But there is something more concrete beneath the looks. And this is the part that Critchlow describes that I keep thinking about.
The brain is a prediction machine. Its basic function—more basic than memory, more basic than emotion—is to build accurate models of what will happen and update those models in the face of incoming information. Uncertainty is not only unpleasant. From a neurological point of view, this is a system error: the brain cannot perform its primary function if there are gaps in the model that it cannot fill.
A relationship, even if it’s over, leaves gaps. You shared a life with this person. You knew their patterns, their moods, their reactions. The model was rich and detailed and constantly updated by proximity. When contact ceases, the model becomes obsolete. And the outdated model is an open question. The brain does what it is designed to do and keeps coming back to the open question. You are constantly looking for information that allows you to update, close the loop, and move on.
You don’t look at their social media because you miss them. He’s checking because his brain is still trying to answer a question he was never officially told to stop asking. The silence after a breakup is not neutral. The brain reads it as uncertainty. And research on uncertainty and stress response it is consistent on one point: uncertainty is the only condition the brain cannot comfortably leave alone.
The shame we put on top
What makes this especially difficult is the layer of judgment that is placed on behavior.
If you’re still watching, you obviously weren’t ready to go. If you’re still thinking about them, you’re obviously not over it, like you said. Appearances become evidence—in his own inner court and sometimes in accounts given to others—of something unresolved, something weak, something that should be ahead by now.
But appearance is not evidence of ambivalence. This is proof that a forecasting system does what forecasting systems do. The brain does not look because it is confused before making a decision. You search because you are trying to solve the information gap caused by the decision. These are different things, and their collapse—if neurological behavior is treated as emotional evidence—creates a lot of unnecessary suffering.
Decision clarity and neural loop closure are two separate processes on two separate timelines. The first can be completed while the second is still running. Knowing this does not speed up the second process, but it does change the meaning of the behavior. Outlook is not a setback. This brain does its work in a situation where there is no clear end to the work.
Which finally closes the loop
Critchlow offers no reference to this, and I think honesty is something to think about.
The brain closes open loops when it receives information—not when it decides to move forward. New experiences, new relationships, new patterns eventually provide enough new data for the old model to become less prominent. It wasn’t exactly a replacement, but it punched above its weight. The loop doesn’t close because you close it. It closes because the brain eventually builds a more current model that no longer fits the old one.
This means that the most honest thing you can do during your search period is to understand what it is. Not a failure of determination. It is not evidence against your own decision. It’s just one very well-documented feature of how the brain deals with the loss of a common cognitive system. Something that needs to be seen clearly, not moralized.
The breakup was your decision. Appearance is your neurology. Both can be true without one undermining the other.
Sovereign Mind lens
This is exactly the kind of problem Sovereign Mind Framework purpose: the brain’s automatic processes generate behavior that we judge morally, not structurally.
- Unlearning: The assumption that “I’m over it” and “I’m not looking” should come at the same time. We’ve adopted a cultural script that maps emotional release onto behavioral closure—that someone who has truly moved on simply doesn’t look back. Critchlow’s work makes it clear that the neural process of closing the information gap operates on its own timeline, independent of the emotional decision.
- Renovation: A brain that tries to close the transactive memory gap is under cognitive load—not dramatically, but persistently. Facilitating conditions are not distraction or forced occupation. The same ones that help the brain process anything difficult: rest, exercise, time away from the input that keeps the old model active. Not as an avoidance, but as a real space to reorient the system. The brain needs new data to build a new model, and that data can only come when you are actually present in your life and not controlling an ongoing loop.
- Protection: The societal pressure to be above a certain point—and the associated shame if you’re not—is a form of cognitive interference. Other people’s discomfort with how long grief and transition takes is real, but it is not information about your process. Recognizing the pressure to act faster than is actually happening and not letting that pressure dictate the story you tell yourself about your own behavior is a form of protection. The appearance has a biological explanation. You don’t have to explain it as a weakness.
I keep thinking of the phrase used by Critchlow. The brain reads silence as uncertainty. Not at peace. Not in closing.
As a question, you have not yet received enough information to answer it.
This frame does not block the search. But it changes what you do with it—I think it’s exactly the kind of distinction that matters when you’re in something you haven’t quite found your way into yet.
