Do guys tease their friends about the girl they like?

I have two classes with this guy. In pre calc he has no friends in the class and he stares at me and is sweet and polite but we hardly talk. Then in English he has two friends there and he doesn't stare at me as much and acts like I don't exist. But his friends smirk at me and when I walk past them they shove him and one time they even wolf whistled at me.

First of all does it seem like he's attracted to me? And if he is, are is friends teasing him because I'm unattractive and are making fun of him because he likes me or is that just what guys do around their friends crushes?
Do guys tease their friends about the girl they like?
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