I'm guessing that he thought he was through with me 4 months ago, is/was in the "in love" stage w/ OW, & is now having doubts. It could be that all my changes & the way I've responded have thrown him off. Or maybe the A is starting to come out of the "perfect" stage. Don't know.
Could be any of them, or a combination of all (hopefully the latter, as it is obviously ideal!). Regardless, I think that he is definitely struggling with this much more now. His physical appearance sounds like it speaks to this (and the teary eyes).
You've done a great job of DBing -- letting go, liberating him to feel okay with whatever choice he wants to make, GALing, and Acting As If. I love reading your posts because I always gain strength from them. Your independence is very alluring (and somewhat contagious!).
As far as the Bday party goes, I would just ask if you think inviting H and/or having him be there will bring you closer to your goals or not. I guess this is my cop-out for giving you advice, but I also think it is a very valid and logical question.