What to do when your crush likes your best friend?

I remember a long time ago a friend of mine told me if I liked a girl, don't worry about who she may or may not be interested in and make a move. I finally decided to take that advice and I asked out my crush.

We had lunch recently, and while it didn't go bad per say, there was no spark. I mean I like her, but she was very quiet, she seemed rather uncomfortable and it almost felt like she just wanted to get the whole thing over with.

I always suspected she liked my friend anyway, but I don't think he likes her. I could be wrong about that though. She always laughs at his jokes, plays with her hair when he's around, often hangs around him more than me, and they have a flirtatious relationship. After asking her out she doesn't flirt with him as much, but I'm assuming it's to not hurt my feelings.

She and I are friends so to speak, but she's much quieter and soft spoken around me. I've given up on the possibility of dating her, so what should I do to move on? I'm still going to see them fairly often (maybe not as much due to the covid-19 pandemic), so it's going to be at the back of my mind. What should I do if things between her and my friend begin to heat up?
What to do when your crush likes your best friend?
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