What is going on?

why do guys stare and talk about you like they like you, but never approach, but they talk to everyone else around them. or you talk to them and they turn the other way while saying a long sentence to you, or help you with classwork, but then tease you, or be rude and mess with you. like this one guy does all that, and i cannot decide if he likes me.

What is going on?
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