Well, his coming back home will present a different dynamic for sure. Expect nothing. I'd advise you not even to think of it as a baby step - do not get your hopes up just yet. There is a long, long way to go.
My WAW never left. She talks to OM every day. We sleep in same bed every night. It is very strange.
You have to stay detached. The common advice seems to be to treat them like a roommate. You are polite, responsive, but not overly eager to see him, and not clingy or prying. You just happen to live at the same address.
The upside is that he will see any of the consistent changes you have made in yourself. Keep doing that. Keep your PMA. That may be easier if he is around to help with parenting to give you some relief.
The downside is that this is a strange situation. From the outside, everything looks like a family. From the inside, it is anything but. Don't let yourself fall back to old patterns just because he is there and it may feel natural. It's time to double down on LRT.
At least, as I see it daily. Good luck. You've already come a long way.
