Oh Emily, I had really hoped I wasn't right in thinking that... I'm terribly sorry your going through this - I know the pain all too well. The one positive thing I can say is that once I found out he was cheating, it helped me get over wanting him back so badly. I took a while, so I understand your feelings right now, but it helped make it all more real for me eventually.
I wish I had some good advice, but it's all been said above. Take care of yourself, vent to us here when you need to, and love that DD of yours!!
Best wishes and lots of hugs.