Please help me with this breakup, it's complicated
So my boyfriend of only one month broke up with me a couple of days ago. It was pretty unexpected considering two weeks before hand he asked me to move in with him and I did. Our relationship became quite much way too fast. Before me he had a girlfriend of over a year who I found out he was engaged to, so obviously their relationship was very intense. But.. She had alcohol problems, they constantly fought, none of his friends or really family liked her, she lied to him about many things, and me and him have never had any of those problems. He broke up with me because he said he couldn't stop loving her, and felt bad being in a relationship with me when he thought about her more. I'm pretty sure she wants him back so I feel really miserable and helpless, and I want to know if there is anything I can do to even try to win him back, because I know he will be happier with me in the long run. When we broke up I feel like I was getting mixed reactions from him as at times he seemed to be considering still marrying her but at other times seemed to think when he 'sorted his life out' he would give us another chance.