There is a particular kind of pain that comes when a child who once ran to you now refuses to be seen in public with you. The door that slams. The monosyllables. The sudden, baffling hostility from someone who, three years ago, asked you to stay until they fell asleep. Parents often interpret this as failure. Something went wrong. The relationship broke.

It did not break. Your teenager is doing exactly what they are supposed to do.

Peter Blos, the developmental psychologist who spent the latter half of the twentieth century studying adolescence, called this process the second individuation. The first happens in toddlerhood, when a child learns they are a separate person from their parent. The second happens in adolescence, when they learn who that separate person actually is. To do it properly, they have to psychologically separate from you. And psychological separation, in practice, often looks like pushing you away.

This is not about you. It is about them needing to locate themselves. The teenager who argues about everything is not being difficult. They are testing their own ideas against yours to see which ones survive. The one who closes their door is not shutting you out permanently. They are building an interior life. The one who is mortified by your existence in front of their peers is managing the unbearable tension between two attachment systems: the family they came from and the social world they are moving into.

Understanding this does not make it painless. But it changes what you do with the pain. Instead of pursuing, which almost always makes it worse, you stay available. You become the background signal rather than the foreground noise. You resist the urge to interpret distance as damage.

The door slamming is not the end of the relationship. In the developmental literature, it is closer to the beginning of the adult one.