Ugh, tough call my friend.
Although I can't say for certain what you would do, I'd keep these things in mind.
1) She was drinking, and probably not in the best position to make any rational decisions.
2) It was only kissing - she didn't sleep with another guy
3) Although I'm certain this seems like a big deal right now, you will likely have much more difficult times ahead if you end up staying together for a long time and/or getting married someday.
4) She was honest with you, after the fact.
Sometimes, it is better just to forgive and forget minor indescretions than to end a relationship - especially one with such potential - over them.
However, on the other side of the fence...
1) She abused, and possibly destroyed your trust
2) It doesn't really matter if she was drunk or not - if she can't control herself while drinking, she shouldn't have been drinking that much. Even if it was partially attributed to being drunk, it wasn't a quick peck - she made out with some dude.
Basically, although she may feel genuinely terrible right now, it may or may not make an impression on her. If she does something similar six months or a year from now, then it didn't really make a difference. If she has indeed learned her lesson, and realized that you're the person she wants to be with, then hopefully she'll avoid such behavior in the future...
Either way, good luck!
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