Why would a man be scared of a woman he is interested in?

Whenever we're in the same room he seems so afraid.

Why would a man be scared of a woman he is interested in?
He's afraid he might come off too sexual and awkward.
He's afraid he might come off too awkward.
He's afraid he might come off too sexually motivated.
He's afraid of his feelings - too strong and confusing.
Something else - please explain below.
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by the way., we have spoken before, we are quite good acquaintances.
Why would a man be scared of a woman he is interested in?
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