My girlfriend got blackout drunk and cheated?

My girlfriend went to a party on Halloween and got blackout drunk for the first time and made out with some guy. I found out like 4 days later and I asked her multiple times a couple days before and went through her phone and found out. She lied to my face and she finally admitted it. Should I breakup with her I don't know what to do... I'm more mad she lied to my face then anything
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For the record I have I posted a couple other questions last week about the same girl so if you read those that might give a better opinion on this question
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  • It's 6 days after Halloween and I just realized I kissed someone that night. It's just a kiss, but if you're more worried about her lying... look at the reasons why she lied, was it to keep from hurting you, scared she would lose you, or was it because she was having an affair. I'd only break up with her for one of those reasons, I think you know which one that is.

    • Well said... Mr. Asker, Most Helpful Opinion this wonderful answer =D

    • It was because she was scared I would dump her but should I just not let her go to any parties without me for now on?

    • You should definitely be with her at parties. But you should also level with her to have control over her drinking. Only bad things happen when you are blacked out drunk, she's very lucky she wasn't taken advantage. Also, make sure you let her know, if you haven't already, that she needs to be completely honest with you no matter what happens. You're in the relationship too, so you deserve to know what is happening.

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