Why would a guy not approach you if he likes you?

Anonymous
There's this guy in my class who keeps staring at me and smiling whenever he catches my eye. He always smiles and says hi/bye to me and it always seems like he wants to say more but never does. He never approaches me or tries to make conversation even when I am by myself. I'm wondering why a guy would do this and if he is interested in me or just being friendly?
Why would a guy not approach you if he likes you?
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