Why do my crush's friends and her keep looking at me?

So the girl I like keeps looking at me and so do her friends. They'll all do it when I'm not looking and sometimes I think they whisper about me. They've seen me look at my crush but only a few times, and sometimes my crush looks at me when I'm not looking too. They even notice me outside of class. Why?
Why do my crush's friends and her keep looking at me?
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