I also struggled with those same feelings while my H and I were still living together. I put my foot down about the phone calls and IMs in front of me and my family and told him OW was not allowed in my apt. It not only didn't stop his behavior, it only made him more certain he wanted a D. I wish I'd had DR back then. The things I did only pushed him away and made him run to OW.
I guess all I can say is just focus on the effect you want, and do the things that might get you there. You sound like you are doing amazing even though you are dealing with a whole range of emotions. Gotta love the roller-coaster ride.
Michelle - Proud DR Rockette S: 28JUL07, D'd: 29OCT09 http://tinyurl.com/27j9qo2