<human>: I am a 20 year old male, in a relationship (just over a month) with a 19 year old female.

Cutting to the chase: Went camping over memorial day weekend, and the girlfriend stayed at home. Got stupid drunk thursday night, and went for a stroll with a girl I used to have feelings for (we never hooked up). We didn't have sex, and didn't even kiss but there was some very extreme cuddling under the stars.

This lasted a while before we got too cold and went back. The second we stopped I nearly puked from the guilt. Hauled to my tent, and basically broke down for a while before sleeping. Did my best to avoid her for the rest of the weekend (couldn't leave, my buddy was my ride) and hardly spoke to her. I have deleted her number, and cut all ties.

I'm awful, though, because I havent told my girlfriend. I love her, have never felt any inclination to cheat before or after, and have never lied to her before. I know for a fact she'd dump me and I'd expect her to, but I can't bring myself to do it. However cheap it feels, I KNOW that so long as I live I will never do this again (to anybody). Is it at all acceptable to omit this one confession, so long as I never do this or anything like it again?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Almost cheated on girlfriend of 1 month, cut all ties with the person it happened with and would sooner kill myself than think about doing anything like this again. Given that, is it acceptable to not tell her?