Sorry for the rough time you're having. I just wanted to say that you haven't necessarily f'd up. The reason I say this is my H left me and we were sep for 4 months. About 2 months into the sep we went on a date at H's suggestion after he talked to his sister who suggested it to him. Up until then we had only gone out as a family for the sake of our very young S. Anyway, we got on fine and had a nice night and then nothing, just like your W. We had quite a few major bust ups after that and I said things like the kind of things you said. About a month later we went on 4 day vacation with S (again for S's sake). We had a great time - I thought yay!! - but no he still wasn't interested said it was all for sake of S and we had this biggest row of all time. I told him I didn't want to ever see him ever again. I was major dark after that as I thought there was no point being any other way. One month after that row he came to me and said he wanted to move back in and try again. That was six months ago. We are having a set back at the minute but prior to that our M was better than it had ever been.
Sorry, I've told it the long way round but I just wanted you to know that all is not lost because of your row. I know its hard but you need to go back to what you were doing before the row to DB and forget the row happened. Good luck!