My BFF has been flirting with my crush?

This all started within one week. So my bestfriend has known I liked my crush for a long time. My crush even seems to like me back. Well starting the last past week, my bff has been flirting with him. She giggles with him and he seems to be playing along. When I confronted her about it, she said "Oh no I have a boyfriend! Why would I like your crush?" and she seemed a bit mad. So now she looks me dead in the eye with a friendly smile and starts playing with him. We were really close and we were forming a relationship until she butted in. Now he doesn't want to hang with me as much.

I understand that he is not mine and I cannot control this relationship. I just want feedback from others.
My BFF has been flirting with my crush?
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