<human>: Can you summarize the given text in a few sentences?

Our one year relationship was going great. I'm a 22 yr, she's 19. We were really good friends for 2 years (honestly, my best friend) and we actually wrote letters to each other for a few months as friends before we started dating. Then my senior year of college and her sophomore year we date and it was great, i would say it was flawless. Then came summer and although we didn't talk too much, but we visited each other and there were no problems. I honestly thought there was nothing wrong. I'm now going to grad school and hour and a half away and I couldn't wait to see her and i know school was stressing her out a lot. Then, after about one year, the other day she drives to see me and she tell me we don't talk enough which was news to me. So I agree we should talk more, I didn't talk to her a lot because I didn't want to be one of those overly attached boyfriends who is constantly talking to their girlfriend. Then, the next day, she calls me and breaks up with me and the only reasoning she can give me is that she's trying to protect herself. She says she can't explain what that means. She also said that similar things happened with all her exs. Her and her best friend got into a fight when we were dating and she cut all ties to her and now the two are complete enemies, but she at least tried to repair that relationship. Help me justify this, I honestly don't know what to think or do.
<bot>: Perfect relationship(22m, 19f, 1 year, knew each other 2 years), met at school, i graduate and move 1.5 hours away, she breaks up trying to "protect herself". Help