As far as putting everything in the past so fast, I'd worry about that. If you don't work through the issues, they'll come back to haunt you. Did you feel satisfied that you worked through things together?
I think one thing many of us here in piecing are afraid to do is have those R talks with our WAS. If you feel things aren't quite right between you, have you talked to him about it? As far as his moods, maybe he's worried about what may happen with the OW? Or perhaps this has just brought up all the old issues with him, too.
