Why do guys act differently around their friends and act differently around me?

Anonymous
Seems like a dumb question, but I'm seriously wondering. This guy, he treats me so nicely and I think he likes me back however he acts so much differently around me than with his friends. When he is with his friends, he acts like he is one of them (like he is so cool when really he is so shy). Also, when he tries to act like "one of them", he DOES NOT talk to me at all. Does he want to be accepted by his friends? Or what? Please no mean comments!!
Why do guys act differently around their friends and act differently around me?
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