He has to make the decision as to whether he stays or not. He may pick another fight w/you or do something to truly aggravate you to the point that you'll say leave...don't do it. No matter what, bite your tongue. He isn't strong enough to just walk away and he needs that validation and/or excuse to do so.
Listen, listen and listen to what he says. If you listen closely, you will be able to pick through some of the garbage he's saying and get to the root of his issues. They love to chatter and you want to see what is truly on his mind.
I would treat him as a roommate and be kind when he's around, but you do not need to tell him about your every move or what you are doing. You want to be a bit mysterious to give him something to think about.
Try to remember, at this time, you have been fired as his wife.
You doing great and you are exactly where you need to be. If you find yourself getting anxious, sit quietly and the answers will come.
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.