Great post! I swear your writing would make a brillant scene in a movie or play - It was a long post but I was so hooked on reading it! I think like you said about my situation - he is noticing the changes in you. There does sound to be some guilt and fear in there too. It sounds like you guys have repaired your communication to the point where he is remembering that you are someone he respects. If he's looking at you (for the moment) from a "good friend" point of view then if you were his good friend he likely would run OW by you for your approval. (Crazy, horrible idea to met OW I agree - but think that is how he meant it?) Heaven forbid if something happens where you end up meeting or talking to this OW - be prepared to be very nice & kind to her. Wanting to run his "choice" by you could also be that he's getting some glimpse that maybe you are not the source of all his problems - that his happiness might not depend on divorcing you and getting a OW in his life?
I think it sounds like you guys are making tons of progress but agree that keep going on with making the changes that you want to make a lasting part of you. But this does seem like confusing, very new territory for you guys, right? So even if this is a good change - it's still hard to know how to react or if there are little things you should be modifying. Trust your gut!
Wish I could see my own situation clearer...but guess that's the value of sounding off our situations to each other here!