Why would a guys face turn red and blush when talking to a girl?

he likes you im a guy and talk to this chick i like and blush and turn red and look away until im over it and then it happens all over she likes me back so it makes it easierWhy would a guys face turn red and blush when talking to a girl?
They're shy and flusteredWhy would a guys face turn red and blush when talking to a girl?
Because that girl is hot.

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