I am sorry he said those things about having nothing to do with your DD if you seperate, hopefully he is just threatening you so you dont leave (tho thats not good either).
As for DD being so upset without Daddy, so was my DS. He was beside himself and his behaviour went nuts, but I really think it was more to do with him knowing how uneasy I felt about hte seperation. As soon as I started feeling positive about it he has been an absolute angel of a child! He misses his Daddy, but not much, thing is his Daddy isnt a great Daddy, so there is not much to miss.
I hope things go smoothly and your DH takes this last chance seriously and steps up to the plate.

