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Before ending it outright, have a conversation with her. To you this is unbelievable, to her it was an acceptable behavior in the past that was encouraged. You two have a lot to talk about with boundary establishment and understanding each other better. Might be something that strengthens your relationship with improved communication instead of throwing it away because of your differences that were not discussed.

I understand she's bi, but to be honest idk a girl who hasn't done that when she's drunk. Your gf might not have thought that you'd look at that as cheating, but more of a way that she thought may turn you on? I only think you should continue the relationship if you're not going to always throw it in her face that that had happened.

I have known a lot of women in late 20s who havent done that.

But she is almost 30, if she was 18 your argument makes more sense, right?

[removed]

Wrong. Being almost 30 if this was encouraged by others and often, it is more embedded in her brain as appropriate, even desired, behavior. You need to open your mind as well and realize not everything is black and white with you being correct just because you think so. If you didn't explain your boundaries and feelings about it, how can you rightly judge her? If you can't understand this concept of growth and learning, you may be in for a lot of bad relationships thinking the other person is always the problem.