charlotte - I know where you are coming from. I feel like this about an ex of mine but I think the reality is that if you got back together the old problems would resurface after a while. The problems were there in the first place for a reason and unless that reason or trigger has changed then the problems will remain.
silentears - I am in same situation as you. I am crazy for someone at work, I have hinted to him that I like him, he knows I do, he has a girlfriend but I know I would do anything for him, drop anything for him, marry him if he asked. Its a mad feeling that I cant control, it is the way it is. One day I hope he can return my feelings.