Why does my crush's friends stare at me?

My crush has friends that are always staring at me and I have lately started speaking to my friend who asks me questions about me/my day and lately 1 of my crush's friends has been going into that class sitting there and staring at me while I talk to my friend about random topics of what I do and etc. (she never really went to this class before until now) So y do my crush's friends stare at me so much? My crush also stares at me, I believe she was actually the first one to start taking glances at me, then her friends all started to afterwards.

PS: My crush flirts with me in 1 of my classes so why are her friends looking at me?
Why does my crush's friends stare at me?
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