Anyone been there? What did you do?

Ok, so me and my ex-gf were together for over a year. We hung out in the same group, and we were pretty good friends with another guy, but he always made me uncomfortable. So, she broke up with me, saying that I did not have enough time to commit to her... after a year??? anyways. I should mention why he made me nervous, I guess. It started when she went to the park, and he was the only one from our group that could go. So, i persuaded parents to let me go, and I can't get ahold of her for like a half hour. They wind up not being where they sed they would b, then he stays at her house after I leave. Few months later, he takes her to the movies. Who else is there? His older sister and her fiance. Another time our whole group was at the movies, and she got mad about something. I try to get her to stay, and she blows me off... i tried for like 5 minutes b4 he tried. He has her persuaded in less than a minute. So we break up. Something like 2 weeks later, and they're together. Wut wud u do