<human>: Provide a brief overview of the text.

We have been together for a little over a year.  She made out with one of her friends that she met a few months ago. We had a talk and she said that she was sorry and that she didn't want to break up with me. She also promised not to do it again, but she is going to a party with him soon and I'm feeling all kinds of insecure right now. How do I convince myself that she's not going to do anything with him again? Should I trust them together? Thoughts about those two doing things sexually/romantically keep popping into my head when I'm at work, when I'm driving, and when I'm trying to sleep. I have never been cheated on before. How do I deal with this?
<bot>: Girlfriend made out with another guy, wants to stay in a relationship with me, is going to a party with him soon.  Should I trust her?