<human>: Give me the gist of the text in a nutshell

Ive been dating this girl for half a year now, and it's been amazing. We connect on almost every level, and I can't believe how happy I am with her.

She and her high school ex almost never talk anymore, but are friends supposedly. He was her first relationship and I believe they were truly happy together. I always sense there's hostility whenever she talks about him though, maybe because they did not break up very cleanly. They broke up 6 years ago. Before we had started dating I remember her casually remarking "Yeah, why /did/ I break up with him?" which just makes me wonder if she regrets it. She even still has a box brimming with poems and letters he wrote her. I dunno what to feel about that.

Recently though, she found out one of our friends is her ex's friend with benefits. She feels betrayed by them both. I get it, but she says its not because she and him had a relationship before, it's just that he never has time for her anymore, but he has time to play around with our friend. I think she's just justifying her jealousy, but I didn't tell her that because she was already upset.

I dunno, Reddit. I just think its unfair to me that she's letting something that happened 6 years ago affect her so much. It just makes me feel not enough for her and her happiness. Of course I might just be reading too much into this... but I dunno what to feel.
<bot>: im having thoughts that my girlfriend isnt over her ex from 6 yrs ago, cause shes very affected that he is sleeping with a friend of ours just recently.