Guys: why do some guys behave so cocky around the girl they like?

There is this guy that I like. I’ve noticed he stares at me many times, but when I smile to him he then just looks at me serous, then to his phone and starts acting all cocky? Like I’ve caught him checking me out and everything, so why instead of approaching he starts acting cocky? Why? Guys…help, I’m really trying to understand.
Guys: why do some guys behave so cocky around the girl they like?
Guys: why do some guys behave so cocky around the girl they like?
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