I broke it off with my boyfriend just last week because I found out he was doing things behind my back "again". I already gave him a second chance 2 weeks into our relationship (he hooked up with another girl), we were going on just a bit over 5 months when last week hit. He was doing everything he could (so he said) to regain my trust, but I found out he was texting another girl about having sex with her when they'd see eachother in the future, she lives 3 states away though.. He basically said he was texting her because he didn't want me to think that all he wanted from our relationship was sex.. and he needed to fulfill his "hornyness" somewhere else. He said he never intended to act on it. (which is hard to believe)

We were in a long distance relationship, he would visit me almost every weekend and we would have sex if we could. It was like, once he walked through the door he wanted to do it right away.. and sometimes I'd just want to talk because I hadn't seen him in a while. We did have talks about sex and how we both didn't want a relationship based on it. I think it kinda scared him maybe? He didn't want to seem pushy when he would want it and to scare me away?

Im just realizing this all now.. that this may have been the problem. But I still don't understand why he would do that behind my back when he said he loved me and wanted to regain my trust. Now he keeps texting me every day saying he loves me and he'll do anything he could to get me back. He said he wants to make things better, but how do I believe him when I already gave him a 2nd chance? I really still do love him.. I just wish I could trust him because without trust there is no relationship.

Do you think it is possible for him to change and to be faithful?
Do I need to be away from him for a certain amount of time for him to realize what he lost and for him to mature?