Keep your chin up. I have heard that when this happens there is some side stepping and serious confusion. It is work for her to come back to you and it does sound like she wants to, but then there is the hurting somebody else and promises I am sure he is making.
continue on "as if" which I am sure is very difficult right now. I can't imagine, hopefully I wll soon, but right now, everything you have done to this point is being tested. you need to hold fast onto what you have accomplished, what you believe and the you you have become.
thanks again for the post on my site, I like having people look after me to make sure I am not failing.