This Hilzoy post on why women stay in abusive relationships is eye-opening:
There are things that are comprehensible parts of the world, even if they're rare, like having your car stolen; and then there are things that are unexpected in a completely different sense, like having your car turn into an elephant before your eyes: things that make you wonder whether you're completely crazy. Being beaten up by someone who apparently loves you is one of those things.
What this means is that precisely when a woman needs as much confidence in her own judgment as she can muster, the rug is completely pulled out from under her. And it's not just that she questions her judgment because she got involved with this guy in the first place; she questions her judgment because something so completely alien to the world she thinks she knows has just happened.