How should I deal with this? >be me (22m) >have girlfriend

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How should I deal with this?

>be me (22m)
>have girlfriend (20f) of 3.5 months
>before me she was fairly sexually liberal, having slept with the same number of people I had (12) but many of those were one night stands on a eurotrip
>things progressed rapidly, both fall in love
>tell girl everything
>tell her about how i feel about specific things (drugs, tattoos, sex, etc) and sometimes how I'd react
>one of these is flashing
>ask if she's ever done it, she hasn't. Tell her that's good and that I don't think I'd like it if she had
>explain I'm just a bit more conservative with the way I view sex and sexual things
>tell her if she ever flashed someone it would be a big deal, she tells me she never would
skip to last night

>she goes out for a "girls night" with her best friend who really likes me and is supportive of our relationship
>receiving snapchats throughout the night
>get a cryptic snapchat "A new currency" captioned over a white screen
>ask what it was about
>tells me "you don't wanna know"
>finally get an answer
>she flashed a bartender with her friend to get a free drink
>go off because this is close to cheating in my eyes
>she's too drunk to talk about it


Should I dump her ass or try to work through it? We otherwise have a perfect relationship and I could honestly see myself being with this girl for a very, very, very long time (though I'm not naive to the fact that this is possibly rose-tinted glasses)

I view it as an absolutely huge disrespect to me, our relationship and even herself. On top of that it's an enormous breach of trust and I've basically lost all trust in her. We have a completely exclusive relationship and have clear boundaries and have had from the start

I think the big reason was because she was very drunk and is high susceptible to peer pressure, but this isn't an excuse

I feel like we could move past it, because it's not really a huge thing, like she didn't actually cheat on me, but it's still pretty bad

What's your /adv/ice?