Hey guys! I am in love with my best friend's twin brother! I wanna tell him and her, but I don't know what to do!

I've known them for roughly 5 years. he's really hot, and I'm not sure if he likes me, but he always flirts with me! I'm not sure if I should even tell her/him, cause I don't want it to hurt our friendship.
Hey guys! I am in love with my best friend's twin brother! I wanna tell him and her, but I don't know what to do!
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