How do I break up with her nicely?

Anonymous
My girlfriend recently revealed she was bisexual. She never told me. I thought I was ok with it but I'm not. After a bad experience with a bisexual woman when I was younger, I don't want to date another one. I also don't want to be with a woman who has had sex with another woman. Worse part is that it's her birthday tommorow but I don't want to be with her anymore. How do I end this without hurting her?,
How do I break up with her nicely?
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