Good thinking about your game plan. You have to be ready for anything as he may or may not be emotional.
A little decandance can go a loooong way. I am the same way with Netflix. I want my money's worth and will keep the movie until I have seen it all the way through at least once, maybe twice.
If he is in a real R with someone else he is going to make accomodations to keep her close. My dad did this and it was hurtful to me as the young person. It felt like he put his girlfriends/ wives above us, his own kids. Sometimes I even felt that he put his girlfriend's kids above us because he did not have to impress us or win our love, but he had to try harder with them.
I actually saw a book on dating a man going through divorce next to DB at the book store. The book talked about how hard it was to have a R with a separated man because it would always feel like a secret affair and the previously married man had to act a certain way until he was free. It talked about when the man has kids and has to shuffle around his schedule for them.