what do i do?

[ironMan]

What is your H's reasoning ...... that says you moving in with him until you leave again later will be better for your S? I don't follow.

Second, I wonder if maybe your H is just trying to avoid the consequences of his decisions/actions for awhile. Acting like a kid.

His decisions have grave consequences for his family .... and he needs to learn that I think. In any case, I think it would be very bad for any hope of a R. As someone else said, it will probably cause even more resentment in him .... and won't make you feel better either. So, what is the real benefit to your S here?