<human>: So yeah my gf who is out of town told me that she kissed another guy that she used to have a crush on and still does. She thought that I should know what because a friend told her to me what she did.

I talked to her but every question I'd ask she would just say that she doesn't know and that's all she kept saying until she said she made out with him once.

Later that night I kept trying talk to her about until she finally admitted they made out many times before. She then told the guy that they should stop and the other guy agree but they're going to continue hanging out.

I lost her trust and loyalty but she says I can trust now after all that happened but I still can't believe her 

So am I dumb for trying to stay and fix this relationship?

Could you distill the essence of the text into 1-3 sentences?
<bot>: She cheated on me. I lost her trust. We're still in a relationship. I'm trying to fix it.