I tried the pursuing lightly simply by telling him I felt I made a mistake, his response was that I had six weeks to change my mind and now it is too late. I have tried all the things you suggested but they didn't work and pushed him further and he told me it was over. Sent me a hate mail blaming me for everything told me he wished I stayed away and that OW deserves more and now wants me to stay away. I decided to grant him is wish and go away. Whatever he is going through he needs to do it w/o me pressuring him he is very hurt, angry, and hateful. I have learned now that he had been seeing OW before I'd asked for the separation which explains his quick decision to get the big D over with.
Right now I am doing what he would NOT expect: not plead, beg, pressure, respond, scream, yell, cry, or take him at his word. I am just going to give him some breathing room to explore his actions and decisions. It is killing me but I think putting any pressure on him is pushing him further and confusing him.
I am shutting the door, not locking, just shutting it for now and waiting for now. There will be a time soon that he will need to reach out to me and I will crack the door open and see where he is.