Why do my crush's friends act like this towards me?

Anonymous
I have a crush on a guy who is crushing on me (according to his behaviour and the signs he shows me).
Since the day I overheard him talking about me to his friends who called me 'hot ', I started to notice them and they did too. By 'his friends' I actually mean 5 or 6 guys. One of them often look at me and one day even tried to push my crush towards me.

When I walk by their class (because they all are from the same class), they whisper, look at me and suddenly become quiet when I pass them.
If I'm around and my crush turns his back towards me, the friend who pushed him tells him something that makes him smile shy and he either turns his head to stare or looks in my way pretending to not look even though he is obvious.
Sometimes when I walk past him and one or two of his friends, the friend who pushed him whispers something to him that makes him smile (again) and he doesn't look into my eyes (what he does almost everytime we see each other).

Today, my crush wasn't there (I tried to find him but... X)) and at the break as I was sitting on a bench, I saw two of his friends coming (the one who pushed him and another that I only saw once). I looked at them, hoping my crush will appear too and then, the friend I've seen only once looked at me, and we stared. He was smiling, I don't know why and whispered to the friend I see very often. So the other friend, who hadn't look at me yet, looked at me, without smiling and tell something to his friend who stopped smiling.

I have never talked to my crush.

Why do his friend act like that? What about ALL the situations? And the last?
They confuse me x)
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The friend stopped smiling but also stopped staring
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I need guys opinions please :)
Why do my crush's friends act like this towards me?
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