I walked past this guy and he started walking by me really slow and then snapped both his fingers at me or thumbs like 3 times? He walks past me a lot?

And when i stared at him after he do that he just looked up or somethkng as if he was looking for something or someone? Is this a negative thing does it mean he doesn't like me? My friends say he stares at me too sometimes and once my little sister was in the cafeteria too taking food and he went up too and my sister had a card there laying with her name on it and then he read up my name two times to his friend next to him instead of mine? And i wanna speak to him but i dont know how a girl is supposed to start something with a guy first,, and when he walks past me with his friend group all of them go quiet.. how do i send signals that i like him

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Also this is kinda disgusting but i was sick once too and threw up in my classroom but it was only me and my two friends there, then a boy walked in from cooking class and told the teacher in the cooking class and then a lot of guys wanted to see from my class and asked me if i was okay but i noticed he was standing there too at my classroom door with them when i walked out the toilet to grab paper? And he is a grade higher than me and doesn't go to my class😭
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Laying with her name on the card instead he said my name two times when there stood her name on it*
I walked past this guy and he started walking by me really slow and then snapped both his fingers at me or thumbs like 3 times? He walks past me a lot?
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