Why do my crush's friends act weird around me?

TsundereMatrix
Ever since my crush realized I like him back after using his friends at our college to help him hint to me that he likes me because he's shy, they've been acting strange around me. They would want to talk about me with him as I was in the room. They were circled around my crush looking at something on his phone as they were talking about how cute him and I are. One even told my crush that they think I have a crush on him out loud which kind of embarrassed him because I was in the room but when I glanced at him after they said that, he was smiling. It's like they are observing me. I never told anyone about my crush on him. Not even my friends at college! I always kept it to myself but still tried to give hints.

Now he has graduated college and got a job so he's not around much anymore but every time I see his friends they look at me like "omg, it's the girl my friend likes!" It's very quick but I notice it. Even the girl he used as a wingman and talked him up to me looks at me like that.

My crush and I have mutual friends too but he never talks about me to them, he just mentions me to the friends that don't actually know me.

Why do a guy's friends act weird when his crush is around?
Why do my crush's friends act weird around me?
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