Remember Cal........your WS has just been removed from the family home (again) and he knows divorce is imminent. Nice no longer exists. He doesn't have to play by any rules now....just his own.
I'm not saying it is right, but it is what it is. Expect the worst from his behaviour. If it doesn't happen you will be pleasantly surprised. If it does, you will be expecting it rather than being hit by Mac truck.
Yes it was dirty of him, but divorce usually does get ugly no matter how much both parties agree they don't want it to.

It is sort of the nature of the beast.
Stand strong and be firm!
If you haven't already I suggest you go visit your lawyer, because I would place bets he already has.
I'm so sorry Cal. I know how hard this is but you made the best decision for you and the kids. You upheld your boundaries and you are showing your H and your children that you won't put up with being a doormat and that pot is NOT acceptable.
Divorce wasn't the way I anticipated my marriage ending either. It will get easier. Like any healing process, this will take time. Go see your counsellor regularily, go out with wonderful friends (like a special one from this board) and try to do things for you now. If Cal was a complete blank canvass in front of you, what would you paint her to look like?
You know you have my ongoing support. Sending you hugs,
(((Cal)))
Kid