What do guys do when they think a girl's too good for them?

Say you're shy and there's this close girl friend of yours that you like (you both get along great) that you think is too good to be true (as in she seems to match almost everything you're looking for, physically and mentally).

What do you do?

Or if it's never happened to you before, what would you do in this situation?
What do guys do when they think a girl's too good for them?
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