Opt, I know it was a difficult and hard conversation... and I am sure you will have more ahead. I've even thought of the conversations ahead that H and I will have to have... ugh. BUT, you need to relish these conversations... understand that you are going to feel lousy after talking to him because he is not (because he cannot) telling you what you want to hear, but he IS sharing with you, he IS talking to you. So listen, validate. Remind yourself that eventually the OW WILL be out of your lives, clearly that is what your H wants.
They all have to clean up their messes. They all have to disentangle themselves from the web they have created. Be thankful and grateful that although your Hs efforts seem to be taking forever, he has decided to make the effort. Hang in there, girlfriend.
Relax. Appreciate. Be calm. Laugh. Enjoy. Be secure. Be loving. Be loved. Don't personalize. Don't ASSume. Accept. Be grateful.