<human>: So to make things simpler, my girlfriend (19F) and I (22M) met through Reddit (surprise surprise) but when we first started talking, she was dating someone else for about three and a half years. She had told me that the last four months or so had gone pretty sour because of some things he had done to her. During these four months, we developed feelings for each other. I knew it was wrong but I kept pursuing her and she finally broke up with her boyfriend. Now keep in mind, I didn't once during this period of time mention that she should break up with her boyfriend. Now, another fact about our relationship is that we are long distance. She's in the next state over and we're both in school.

I feel incredibly insecure and terrible that I have so little faith in her, that it could happen again; I could lose her to someone else. Every time I bring it up, she would get extremely defensive and guilt me into thinking that I'm absolutely ridiculous for not trusting her and we would get into a huge spat. She feels I have no right to feel this way because she constantly reassures me that she loves me and whatnot. So r/relationships, is what I'm feeling indeed ridiculous or is it alright?

Summarize the given text in a few sentences.
<bot>: Met girlfriend while she was in another relationship. Broke up with her boyfriend after emotionally cheating and feels like I have no right to think that it could happen again. Whenever mentioned, she gets defensive.