Best female friend's boyfriend hates me. What to do?

Anonymous
Long story short: Was rejected by female friend, started over, and it's well known all at my school that I still like her

My friend who I considered a good friend, apparently only considers me an acquaitenance. He went behind my back to date her, and yeah they're dating

I told her it's effed up he did that to me, and she sorta defended him and brushed off whatever I said. I'm a bit mad at her. I'll admit I did say some bad things about him, and it DOES seem like she told him(and that's why he hates me). But me and her are best friends and have a lot of trust..

Should I be mad at her for dating him? Does this complicate the friendship with the girl? Should I be mad at her for what seems like she betrayed my trust and told him some things I said?
Be friends with her
Don't be friends with her
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Best female friend's boyfriend hates me. What to do?
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