What does it mean when a guy tries to impress you?

I feel like my crush is a completely different person around me and not in a good way. He's usually a super nice guy to everyone but he's always acting like a jerk towards me for no reason really. He's always trying to be cocky, a smartass and a "bad boy" but he's not like this with the other girls.

I also get the feeling that he's trying to impress me in some way because he seems very nervous and awkward around me and acts very weird. His behaviour is totally strange around me. What's up with him?
What does it mean when a guy tries to impress you?
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