Why does he act differently when we are alone vs when we are around friends?

Why does he act differently when we are alone vs when we are around friends? When we are alone he is so nice and always smiling. He tells me things he claims he doesn't usually tell anyone and we maintain eye contact. I even catch him staring at me while in class. When others are around he does not try to talk to me, but I do see him look at me every now and then. It is as if I am not really there to him at times with others. Why am I dealing with two different personalities here?
Why does he act differently when we are alone vs when we are around friends?
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