Why does my girlfriend want to go to prom with another guy (who she says is a friend)?

shadowarrior99
My girlfriend and I have been dating for two and a half months. On the second date she asked me to go to prom with her (two months ago), I said yes. A week ago I asked her how much it was and she said just give me the money and I'll get the tickets. Yesterday she said her friend asked her to go before me (then why the heck did you ask me to go to prom?). She said he asked first. Apparently, it is a girl's firm, moral belief when a guy asks something before another guy, its freaking okay.

Ironically, I lost a previous girlfriend over a dance last year. Her guy asked her before me while we were dating, so that made it okay to go. She later broke up with me for this guy (that was a whole different girlfriend).

Back to the now, She said she's graduating (so am I) and its the last chance she has to be with her friends. She says she is going to be talking to her friends and doesn't want to make me feel bad, especially if she flirts with another guy. I threatened to break up with her, but she aggressively didn't want me to. I am confused on her behavior. Is she cheating on me? Why does she want to go to the prom with him and not her boyfriend, even though she says she would love to go with her bf? I believe she made up a lie somewhere in all of this. Help me!
Updates
+1 y
I forget to mention she likes to flirt, she says she likes to flirt with other guys. But I'm still her guy. She says she wants me to trust her. She said if the guy makes a move she will punch him.
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+1 y
Thanks everyone for agreeing that something suspicious is going on. And ladies its a big boost to know that she should go with her boyfriend to the prom, not her friend. If she doesn't change her mind I'm dumping her. I'm giving her some leeway because I'm a nice guy, I should sump her for even considering to go with someone else. Ill let everyone know what happens, thanks for your support!
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+1 y
Hey everyone, my girlfriend changed her mind and said she is going with me, so it looks like we're staying together. :) Thanks for your help everyone.
Why does my girlfriend want to go to prom with another guy (who she says is a friend)?
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