hey bant so I've been having a moral dilemma and it honestly fucking blows it's been slowly fading away but keeps popping up. let me get into it I didn't really want to take this to /b/ and all of my friends are generally loose lipped so...

>be me
>18
> friend of mine wants to get laid
>invites me over to this girls house
>girl he wants to fuck is there and she also invited another girl
>I currently have a qt3.14 gf who depends on me heavily emotionally and such I love her a lot.
>She lives really far away from me at the moment planning on moving to her area in a few months
>so I'm at this house and everyone starts making drinks because that's pretty much all you can do in my town
>I never drink but decided to get plastered because why not
>night is winding down buddy of mine goes into basement with his grill
>me and the remaining chick alone upstairs
>I made more drink for myself and eventually black out
>wake up at home in my bed clothes still, keys in hand.
>get a message from girl that i blacked out upstairs with
>she said that we had kissed
>PanicAttack.wav
>I tell her that if it ever did happen not to tell a soul or else I'd blow my brains out

what should I do. I love my girlfriend and I've never cheated in my life. If she did leave me I'd probably kill myself.