Why has he started staring at me after finding out that I like him?

He stares from afar on purpose (turns around when he sits in front of me) and holds his stare and sometimes looks surprised when he sees me enter the room or looks back at me when he leaves. He also talks about me to his friends who seem curious about me. Is he just flattered and curious but not attracted?

Why has he started staring at me after finding out that I like him?
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