You now know what buttons you've pushed that brings the angry monster out to play, so...don't ask about the ow, relationship, etc. Keep your conversations light and airy, in other words talk about the children, the weather, sky or finances, but leave any relationship talks out of the equation.
If he should flip out on you and go from Mr. Nice to Mr. Monster during a conversation, change the subject to the children or the weather...he may very well calm himself down and go back to being Mr. Nice.
For now, leave him alone and if you can do things around your home yourself or have family/friends that you can rely on, then by all means do so. Your h hasn't completely detached and just as long as you don't rock his boat w/questions, etc., he just might be the type to hang around and do things. Time will tell on that.
There is always hope in any situation, but you will know when you've had enough...but for now, leave him alone, keep the focus on you and your children and one last thing...always thank him when he does something around the house. He needs to know that you recognize and are wiling to acknowledge his efforts there.
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.