<human>: Ill try to keep it short and sweet. I'm still in highschool, and like most highschoolers I drink. Last night, my friend and his family were out of town and he gave me their key so we could throw a little gathering at their vacant apartment. Which we did, and it was killer. But by the time I was being dropped off by my girlfriend, she broke the news that she had "hooked up" (made out with) a guy at a concert a few nights before. She promised before the concert that nothing would happen, and she would tell me if she hooked up with anyone. She didn't spill the beans until that night of the party. Obviously I was pissed off, and went straight to bed, only to wake up and find out that the owners (my friends parents) of the apartment had found out about the party. I had to call and apologize and I'm in pretty big trouble, and to make things worst about a month earlier I had gotten a citation. So my parents are pissed off. Any advice on the gf cheating on me part. She was drunk and she claims that she didn't hook up for long. She did the classic call me crying bull and had apologized profusely. She still cares, and I do too, but I have morals. Can I trust her after this? Am I over reacting? I just need some help right now.

Provide a brief overview of the text.
<bot>: Threw party at friends vacant apartment, find out gf cheats on me, friends parents find out about the party.