Why does my friend keep bragging and simultaneously putting me down?

My friend keeps bragging about how pretty she is. Granted, I think she's beautiful, however her bragging annoys me sometimes.

She tells me she intimidates people, especially other women, because of her good looks. And that she has problems with female friends because she's the prettiest one in her social circle. She then said that while she's intimidating, I'm not in any way intimidating, though.

She said when we're out in public everyone stares at her, and she says I never get stared at (which I do). She also "body-checks" and compares her body to mine to make me insecure. She points out my insecurities. I think we're both attractive women, and this irritates me to no end. What should I do? Why is she doing this?

Why does my friend keep bragging and simultaneously putting me down?
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