Why did he do that?

I just went to a two day party where I met some of my old family friends. But there is this one cute guy (22years old now), who I’ve known since I was 7 (soon 18).
Yesterday he started to ask me how old I was, yell in my ear (to scare me), he kept staring at me with a little smirk, and scare me and my friend in a tent when we almost went to sleep. He totally dissed (with mean stuff) my friend, but not me. Not at all.

Oh and every time there was this girl talking to him, he’d stare at me.
So I have that question, why did he do that?
Why did he do that?
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