Thumbwitch, mine did that too. The 'shall I, or shall I not, go back home?' routine. That was absolutely horrific, and after 2 months of it, I had to just cut him out of my life because I couldn't stand the feeling of not being in control of my own emotions. I started divorce proceedings, decided he had blown his chances, and started trying to get over it.
My xh was also very cold towards me, Joggeroo. I couldn't comprehend that I used to love this ice-block, because he now looked right through me as if I didn't exist. And he re-wrote the history books so that I was some mental-lentil that ought to be locked up, and he was some long-suffering loveable chap (he had umpteen affairs, so really not my opinion of him at all).
It's all a matter of trying to live with the things we have done, the decisions we have made, and the things that have happened to us. We tell ourselves our own stories, and grow to believe them, in order to be comfortable with ourselves as individuals. He probably feels as much guilt as you feel pain, but he is blame-shifting, in order to be able to live with himself.
My xh is now the world's best dad, too (ahem). He never lifted a finger, and screamed and shouted at them the whole time when he was here. Guilt again.
I hope you're okay. Keep talking if you need to Joggeroo.