Relationship advice please?

My girlfriend and I of a year and a half broke up. She broke up with me. I was extremely controlling to the point of not letting her hang out with her friends. She began to lie to me so I wouldn't freak out. Her friends were horrible to me but tried to reconcile but I wouldn't. She left me for this guy and they had a little relationship going. She hadn't felt anything for a while. It has been about a month, and i've been in therapy for months and am better now. She says she misses me and still cares about me and loves me last night it just took her a long time to realize it. We weren't happy. But it may not be anymore. I feel like we have both changed. She is friends with all her example which bothers me a little but she was honest last night. She has crushes on two of them. One said no and is in a long relationship. One avoids her. She says she likes me better and wouldn't cheat. We both said us wouldn't happen anytime too soon. But I need advice. My heart says yes. We both just graduated high school so we are young and I think we could maybe have a more casual relationship. I could be clouded.. advice please?