I know this sounds difficult, but this approach may help a little bit. Treat your h cordially as a distant business associate. You are pleasant, however you don't push anything. Keep focusing on detaching and you will soon find that you don't wonder what he thinks or why he acts that way or what he is thinking. The operate on sheer emotion so trying to figure out what is going on in their head is like trying to figure out how to solve PI. Don't bother!
Like BG said, you aren't excusing bad behavior. You can't control that part-only how you live and behave. Keep the focus on you and the kids and you feel positive momentum.
3 kids BD 12/15/13 (IDKIILY. ) Rope dropped Cirque du Soleil style D final 9-9-14 "Some people are born on 3rd base and go through life thinking they hit a triple." Barry Switzer