My cousin has a crush on me. What should I do?

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A2A, in my opinion, you should do nothing. Don’t avoid contact with her, but don’t encourage it either. Just pretend like you don’t see it at all. Be excessively dumb about it. You don’t want to get too close, but you don’t want to cut off contact either. So you have to walk a fine line between unnecessary roughness and gentle discouragement.

You can’t win here. All you can do is not lose.