Nikki-- I am so sorry. I know how hard this is, and what you may be facing. I had the same kind of convo with H months ago--how can you pick a "friend" over your W's feelings? Then I found out how. I really hope it's not that, but it could explain the stalemate and his self-hatred. I agree--yuck.
Good note--you already know that he didn't like being alone; he came back.
Since you are trying to piece and have a C apt coming up, do you think he would read the infidelity articles over at MarriageBuilders.com? It talks about being addicted to the OW, and how you have to stop cold-turkey.
Did you guys talk about the counseling sessions, and who is going when?
Good luck to you over this weekend...I'll be checking in.