My friend has told me she envies me and keeps trying to flirt with men who like me. What should I do?

She said I make her feel insecure about herself. She keeps trying to weasel her way into my relationships but denies it if I confront her about it. I feel bad that that's the reason (her being insecure) but she clearly wants what I have. What should I do?

My friend has told me she envies me and keeps trying to flirt with men who like me. What should I do?
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