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Your post is all over the place, so I'm not entirely sure what exactly you're upset about. Is it that she had sex with a guy who turns out to be gay and he is now her best friend? Or that she had a threesome with him and another guy?
You were with a guy for 3 years, and now you're straight? And because you were mad at her one night, you had a one night stand with someone else, so now you feel guilty?
I'm confused.
In any case, yes, the past is the past, especially since it all happened before you were together. Yes, she's friends with her gay friend that she slept with, however, poeple experiment with their sexuality when they're younger, and sometimes they are "bi" for a while until they figure it out. And they have threesomes for fun. If this isn't something you can handle - that she experiemented and had some fun without you before she knew you - then you have to end this relationship.
And if you're going to cheat when you get upset, yes, you have to end this relationship. It's not fair to her. She's not having sex with other people now - you are.
Decide what is most important to you - being with her, or being with someone who's past you can live with.
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