Why would a guy stare at you with a "frozen" look on his face?

My crush always stares at me and his face literally freezes when he does. He doesn't even blink and there's a blank open look on his face. His eyes get all around too lol. I've experienced this with some other guys too and it looks kinda weird.
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Why would a guy stare at you with a "frozen" look on his face?
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