How can you tell a guy genuinely likes you and not just looking to hook up?

Anonymous
This guy in my class gets nervous and shy when he is around me and doesn't talk very much. He always smiles and waves at me and says hi/bye. It seems like he wants to say more but never does and I can tell that he likes me because he stares at me a lot. Do guys act this way when they care about a girl and want to date her or just hook up?
How can you tell a guy genuinely likes you and not just looking to hook up?
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