My GF just told me she had a sexual past with both my brothers before we dated

Me and this girl have been dating for 8 months. We were best friends before for like 4 years. Everything was good. We are both the same age (17). She had a thing with my middle brother when she was 13 and he was 15. The used to make out and the farthest they went was a blowjob.

Then she made out once she says with my oldest brother when she was 15 and he was 19. She said that was a quick thing. It's been 4 weeks since she told me all this and i respect her for it. My brothers couldn't even tell me. This has made our relationship very weird. I have calmed down from the anger and now im just trying to get over it. My brothers haven't been good brothers to me for most of my life which makes this issue kind of worse.

We have been long distancing for about close to 3 months. She decided to tell me now. She said she forgot about it which i doubt then it started biting at her so she told me. We have had sex and she was my first and i was hers as well. this has fucked things up majorly for me. I love her a lot. When i think im over it. it comes back to me.

You guys may think she's a whore for this. She said she just wanted to feel accepted by someone. She said she didn't get attention from guys in her life. So my brothers gave her the attention she wanted.