Definitely, he needs to not stay overnight anymore. You need to reduce his power to hurt you. If you can't bring up his post-MC abusive behavior in the next MC session, I'd say stop it for now- or talk to MC yourself once to let her know what's going on outside of MC. If he's just undoing all progress as soon as you guys leave, there's no point in keeping up that charade for now.

Are you still seeing IC? Will H stay away from house if you tell him to? He needs to see S elsewhere right now, Hope. you need to take back your house and space- re-read my post from yesterday- gather back your strength.

(((Hope)))

When the men on the chessboard
Get up and tell you where to go;
And you've just had some kind of mushroom
And your mind is moving slow;
Go ask Alice...
I think she'll know.