My apologies, I edited my comment as you were typing I think. I added some more.
Walking away from a toxic situation is not "psychopathic." It's common sense and if we all did it more then the psychopaths who expect us to stick around through it all would finally learn how to treat other people with respect. It's a job, not a marriage.
Sadly, I've seen this. Not first hand, but it happened to a friend and I have no reason to doubt his version of the story.