You must go back and start from the begining and figure out what part you had in contributing to this.
I'm confused at your comment...I already did all the work on myself while we were separated in 2006. I made a ton of positive changes for myself, GAL, went back to work full-time, go out with girlfriends at least twice a month, I don't give him a hard time about anything - he has a great life - practices MMA 16 hours a week, goes out with his buddies whenever he wants (maybe once a week - sometimes less) and never hears crap from me about any of it - he wakes up in the morning, rolls out of bed, gets in the shower and leaves. There is NOTHING that I did to contribute to this, this time around. That is where he is coming from when he says I am not to blame at all this time. That it's all him, not me. (Complete opposite from when we separated 4 years ago) He has been telling me constantly for the past 4 years that our M has never been better and how happy he is with us!
I admitted fully last time that I needed to make some changes and improvements and I made them ALL(for me!) And so it turned out that he came back because he was really happy with what he saw.
This is where I am stuck - because what else do I need to do???? I'm not saying I am perfect - no one on this earth is. But I made the changes within myself 4 years ago - and in the end, it truly hasn't made any difference for him as HIS issues are all resurfacing again. And now he keeps harping on the M issues that we had BEFORE - the issues that have been resolved and that he can't seem to let go. Even though things have been great, I've been great, he can't get the PAST out of his head, so he tells me.
My trust issues may not have disappeared but he has not given me any reason TO trust him now or then. That's not my fault. It's him!