Why do his friends stare at me?

This guy and I liked each other for a long time but never dated. We both graduated from high school last year and he's in Europe now volunteering before college this fall. I haven't seen or heard from him in 8 months. However, I still see his friends and they still pay attention to me. All the friends know the guy used to like me and that I liked him back. Their reactions are weird. They always watch how I am with people, see what I'm wearing, look at what I'm doing, how I behave. One of them checks out my body/face really closely and I don't know if it's cause he thinks I'm cute, or wants to know what his friend liked (although he looks upset when I fix my top so he can't see anything).

Why do they still pay attention to me?

Why do his friends stare at me?
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