Repetition compulsion describes an unconscious pattern where someone repeatedly places themselves in situations that echo the dynamics of an earlier trauma, rather than simply remembering or processing that trauma directly. Bessel van der Kolk's clinical observation is that this isn't a deliberate choice or a conscious desire to suffer again — it functions more like the mind attempting, unsuccessfully, to gain mastery over something it couldn't control the first time, by recreating a version of it that feels at least somewhat familiar.
Recognizing repetition compulsion in oneself or someone else isn't a matter of willpower correction — it requires actually processing the original trauma, since the pattern is driven by an unresolved wound seeking some kind of resolution, not by poor decision-making that a person could simply choose to stop.