How come some guys become interested in a girl once they find out that the girl likes them?

I don’t get it. If the girl LOOKS and BEHAVES the SAME before the guy knew she was interested in him, why just now is he interested once he finds out she’s interested? Were her looks/personality not enough for a guy to have a crush on her before he knew she had a thing for him? You see, personally I would know if I’m gonna have a crush on a guy or not, even before he expresses interest in me.
How come some guys become interested in a girl once they find out that the girl likes them?
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