I would say pray about it and ask God to lead you and your words. I don't know what is the best. In my sitch, H said all those things to me, how it isn't fair to me and how he has messed up and I shouldn't have to wait, but since he left I can decide to go and file and there wouldn't be any hard feelings, etc. I have heard it all and I think that is the guilt talking.
H seems to not be drinking as much, or at least you don't mention it as much so maybe this now is his medicine of choice for the depression. Stroking his ego with OW. It isn't right by any means, but it still could be a symptom of the depression just like the alcohol, only this does a whole lot more damage.
I really have major advice but pray and do what you feel is best and don't second guess yourself. Remember to listen for the still small voice and the first one because I have been taught it is that voice that is God's. I hope all goes well and don't push anything unless you are ready. Do what is best for you.
Me29 S3 H left 4/1/09 I file 8/2/10 Divorce final 5/17/11 1st http://www.tinyurl.com/25lhu52 2nd http://www.tinyurl.com/2c35ueg 3rd http://www.tinyurl.com/322yk89