Every guy I like, likes my best friend?

I dont know why but every guy I like end up liking my best friend. And everytime I am into someone he just suddenly become interested in her, although she doesn't like him. It happened 6 times!!! I can't handle it no more and I'm afraid of it everytime I fall for someone. It may happens because everyone knows we are bffs and maybe when a guy pay attention on me he naturally see my best friend and just fall for her, because she is much more prettier than me. I feel depressed and I have no one to talk to. Please help me
Every guy I like, likes my best friend?
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