Hs sleeping in different rooms seems to be going around lately, mine, yours and a few others I've read today.
So, you know, stop tormenting yourself with all these thoughts about H and OW. I think he's just tyring to tell you he needs some space (damn, I need to listed to myself!). You said that this week you've been together a lot and he's not working much so there are money worries, at least in his minds. He's got a lot of his mind, let him think.
I'm like you. When XH stays out or sleeps on the couch, I sleep like crap. If I sleep. Go buy some tylonal PM or something to take on those nights, I take a Xanax. But what ever you do right now, don't take it personally. Just keep telling yourself he just needs some space. Remember, up and down we go...