morgan, heck my H isn't even with OW right now (to my knowledge LOL) and I am having a hard time not thinking about him. You are more than allowed to have your mind wander about this weekend. You were thrown off by him breaking down and not knowing what that's all about. Don't assume he is focusing on the future and coming to a 'close' with you. That might not be it at all.
BUT.....wanted to say, I totally know how you feel about H getting sad when they think of divorcing, but the 'sad' ONLY being about the kids. When I kicked H out when he confessed, he cried, but I still to this day think its because he was going to miss the girls, not over me. I suppose that's good in a way, because no matter what happens, I want (as I am positive you do too) H to always remain the wonderful father he is, and to stay attached to them.
Drink your wine, have your thoughts, and make peace.
PS: Sorry about your AC. Remember, no comments to H about it, fix or don't fix, but its your decision.