I'm sorry he's starting to play a bit of hard ball w/you. He did have some time to think about things and came to realize that you meant business. Mlcers are like children. When they are told that they can't have something, they will do their best to get what they want. Your h is doing the same thing.
In a way, he is using veiled threats towards you. I, personally, wouldn't like that. My xh did that and he got what he asked for...cage door openned and I shoved him out.
Continue to set your boundaries. He can't have both of you. He needs to either cut the ow loose altogether and focus on his issues and try to work on the marriage w/you or he needs to go. Cake eating isn't going to help the your situation and it will create a lot of stress for you.
Unless I am totally off base here, he's going to pull out the stops and try everything he can to get your attention, whether it is good or bad behavior. When he doesn't get his way, the veiled threats will come out. When they do, react in a calm manner because mlcers can get ugly and mean very quickly once they've been found out.
I hope today is a good day for you.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.