Why a guy is always super nervous around me?

I have crush on guy we meet daily he knows that I like him but now he is always nervous around me I dont know why
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He doesn't have social anxiety infact he is the frankest guy I have ever seen he is so bold but he is always nervous around me only also he is not of shy type I am shocked how a guy like him could be nervous
Why a guy is always super nervous around me?
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