How do I know a guy wants to get to know me?

so there's this guy and we never talked. we're just passing by in the school hallway and he sometimes looks at me, it doesn't seem random. I also meet him more than other people. it's happening for more than a year. and I think his behavior tends to change sometimes when he sees me/is close to me. I'm curious whether these signs could mean he might want to be friends or something.

How do I know a guy wants to get to know me?
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