You have watched yourself do it. Someone starts to matter, and you go quiet, or you pick the fight, or you find the flaw that gives you permission to leave first. From the outside it looks like coldness. From the inside it feels closer to self-defense, though you could not say exactly what the danger is. Afterward you sit with the familiar mix of relief and regret, and you wonder why you keep doing the thing you say you do not want to do.
You have probably already been handed the standard explanations: fear of abandonment, fear of rejection, walls that need to come down. Maybe they fit. Maybe they arrived too quickly. Three thinkers on the Consilium roster would approach this from fundamentally different directions, and only one of them thinks the pushing is a problem to be fixed.
Winnicott: the hiding hopes to be found
D.W. Winnicott spent his career watching what children do when closeness has not been safe. He would say the pattern is not coldness at all. It is a guard posted around the most private part of you, the part that once learned that being fully seen meant being intruded on, managed, or used. Pushing people away is what that guard does when someone approaches without knocking. The defense is old, it was built for good reasons, and it does not care that the person at the door now is not the person it was built against.
It is a joy to be hidden, and disaster not to be found.
But Winnicott would not stop at the diagnosis. He would point out the strange doubleness of the move: the same gesture that pushes people away is also a test of whether anyone will stay. The hiding is real, and so is the hope inside it. He would ask what happened to you when someone last got all the way in, and whether the people you are pushing now have actually earned the sentence you are handing them.

Schopenhauer: the porcupines were right
Arthur Schopenhauer would refuse the premise that something is wrong with you. He told a parable about porcupines huddling together on a cold night: they crowd close for warmth, prick each other with their quills, back apart, get cold, and try again, until they find the one distance at which they can survive each other. That distance, he said, is what we call politeness and good manners. It is not a failure of love. It is the accurate price of proximity between creatures who can hurt each other.
The need of society drives the human porcupines together, only to be mutually repelled by the many prickly and disagreeable qualities of their nature.
So Schopenhauer would say your reflex may simply be perception. Closeness does cost something. People do wound each other, mostly without meaning to, and the ones who get closest wound deepest. He would not tell you to dismantle the distance. He would tell you to calibrate it honestly, and to stop treating your own quills, and everyone else's, as a scandal.

Rilke: the distance was never the problem
Rainer Maria Rilke would question the question. You push people away, he would say, because somewhere you accepted the idea that love means merging, that real closeness dissolves the boundary between two people. If that is what closeness is, then of course something in you fights it. What it is fighting for is not distance from the other person. It is the survival of your own solitude, the inner room where you are still yourself. The reflex is not the enemy of love. The definition is.
Once the realization is accepted that even between the closest human beings infinite distances continue to exist, a wonderful living side by side can grow up, if they succeed in loving the distance between them which makes it possible for each to see the other whole against the sky.
Rilke would ask you to imagine a closeness that does not require surrender: two people who guard each other's solitude instead of invading it. In that arrangement the distance you keep instinctively is not a wall to be torn down. It is the very thing that lets the other person see you whole. The work is not to stop protecting the room. It is to learn to let someone stand at its border without panicking.
Where they disagree
Winnicott says the pattern is a defense with a history. It was built in rooms you no longer live in, and underneath it is a wish, the wish that someone would find you without trampling you. The pushing protects something real, but it is aimed at the wrong decade.
Schopenhauer says the pattern is not a wound but an observation. Closeness genuinely costs, everyone carries quills, and the sane response is not healing but calibration: find the tolerable distance and hold it without apology.
Rilke says both of them have accepted a false picture of love. The question is not how close or how far. Distance belongs inside love, not instead of it, and what needs to change is not your reflex but your belief about what closeness demands.
The structural tension is this: one of them thinks you are protecting an old injury, one thinks you are perceiving a permanent truth, and one thinks you are defending something that was never under attack. None of them would tell you what to do.
The question you came here to avoid
You searched for why you push people away, which is a question about mechanism. It is also a safer question than the real one, because as long as you are investigating the cause, you do not have to decide anything. The harder question is not why the guard exists. It is whether the thing it protects still needs protecting from the particular people currently standing at the door.
So take the question one layer down. If someone found you tomorrow, exactly as you are, no performance and no warning, would you let it happen? Or has the hiding become the only place you still feel like yourself?