Two girls one guy?

I've been dating a guy for a while now. we met in school and I had a friend. we did everything together and she had a thing for bae before we were together but I didn't know that. one day she stopped talking to me after I started dating him and I didn't know why. later I learned about her feelings for him and she's been treating me badly since then. what do I do about her
Two girls one guy?
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