I think my best friend has a crush on me. It makes me feel awkward.
That's happening with me right now. It is a really awkward feeling. But if they don't really act on it, or make you obscenely uncomfortable, you don't have to worry about it. Only if this person acts on it, or starts to cross the line, you might need to lay it out for him.
My wife has had those on a few of her own friends. Its more like... admiration. A 'mentor' kind of thing? Its a mix of respect and friendship. I don't think she thought about sexual encounters or anything like that. Maybe just masturbated to the idea at most.
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