<human>: We're both early 20's dating for about a year, I moved to a new city temporarily and we've been communicating via skype/phone and things were going go. I get kind of lonely in the new city so I went out to a bar to potentially meet people. I got pretty drunk and went to the next-door bar. drank some more. Decided to go home and as I'm going home I say fuck it, I'll go back to the last bar and have one more drink. I go there meet these 2 people talking, the dude is really bad at talking to her and I kind of join in the conversation. Now at this point I'm just talking cause I don't know anyone out here and why not? Well the dude ends up leaving so it's just her and I. In the bar we weren't flirty at all, just friendly and getting more drunk well when we leave she asks if I want to hang out at her place. I know this is a bad idea but I kinda say, I wont do anything...it'll be fine. well we get back and we start fooling around, almost instantly and eventually it leads to sex. As soon as we finish I'm gain a sense of soberness and think "AHHH WTF DID I JUST DO?!" I talk to the girl about it, she's older and basically says I feel bad but there are worse things that happen, you are young and it isnt that bad. 

before that night I was never the "cheating type" I never thought I fucking would. the relationship with my gf has kinda been rocky for a while but nothing too bad. I know if I tell her she will dump me and as selfish as it is, I don't want to look like the bad guy (even though I know I am). I really want to be with her, I love her and had a moment of stupidity. To make things worse she is visiting me in a few weeks and already paid (a lot) of money for the trip. 

Reddit, do I have to tell her? Can I try to forget it and continue with our relationship, I want to hear people's personal experience with this matter.

Can you provide a brief overview of the text?
<bot>: I got drunk and cheated on gf of about a year, it's not me and I could easily never do it again. Can I avoid telling her the truth and just bury it?