I need help figuring this out

By way of background, I've been married for a little over 7 years. My husband had two previous marriages, I had one. We unsuccessfully tried to blend our families. The tension got so bad in the house, I told him to leave twice. This December, while I was completing my chemotherapy, he bought a house. I found out, even though he denied it for weeks. In February, once I had the proof, I told him to leave. He left with his daughter and moved to the new place. After a few days, we made a commitment to work things out, and sought marriage counseling. We had some bumps and bruises along the way, but nothing major. We spend most of our free time together, have vacations planned, have sex, the only thing we do not do is live in the same house. When I do stay at his house, his daughter is very contemptuous towards me and recreating the same situation that we had when we tried to blend the families. Up until today, I thought everything was going great. We just said last night that neither of us want a divorce, we want to work towards co-habitatating, we love, each other, etc. That was until I found his profile on yahoo personals. I confronted him over the phone and he denied it was him (he blamed my friends), he flipped out saying he can't take this any more, blah, blah, blah. I finally calmed him down and myself and told him to just tell me the truth. He did. It is him. He said he put it out there because he is lonely. He assured me he did not break our vows, that he loves me, that he is ashamed, that I don't deserve the shit that comes with him, etc. I am so hurt, I do not know what to do. I understand he is lonely since he moved away, so am I. But I am not out there putting a personal ad out on yahoo. I want to believe him given our circumstances, but I don't know if I should. My life is a freaking mess and I need somebody to chime in who does not have anything vested.

Thanks