<human>: Give me the gist of the text in a nutshell

My girlfriend of 4 months who I have really fallen for moved to AZ from NJ to stay with her grandparents and we started dating in September she went back to NJ for the holidays and came back on Jan. 12 and just told me yesterday that she had kissed someone while drunk at a party. She feels like shit and keeps telling me how bad she feels and how much she loves me and is scared to lose me. I know shr just made out with someone and said she pretty much stopped right away. But I don't know what to do now or if I should even trust her anymore. I need advise.
<bot>: GF made out with a guy while she was drunk at a party while on vacation.  I don't know how to handle it and don't know what I should do. Especially since she waited a month to tell me.