<human>: I just got back from an 8 day cruise. During the weekend my GF traveled to Chicago with her friends and stayed at a guy friends house. She made out with one of her guy friends friend. She says they only made out and she only did it because she was drunk, lonely, and has had low self esteem since she got braces. Over the cruise I had a feeling she would do something like this. We have each slept with one other person since we started dating a year and a half ago while she was studying abroad. Since then we have been great and I am madly in love with her but I feel like I am more in love with her than she is with me. I honestly don't know what to do or think. I was supposed to go visit her this coming weekend since we live on opposite sides of the state but I don't know anymore. I want to be with this girl but right now my trust is shot.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: GF cheated while I was gone. Don't know what to think or do. Any advice is very appreciated. I feel like absolute shit.