based off of the information you gave me, i do think he has an interest in you but is shy to talk/approach you because he sees that you prefer to be on your own. i don't like the word loner - you are independent! and that's a good thing.
however, you won't ever know what his intentions are or what he's feeling unless you step out of your comfort zone and simply, ask him. there's no harm in at least asking or speaking to him to get a direct answer so that you won't be left wondering. i know it can be intimidating, especially since you mentioned that he's part of the popular crowd at school, but he's the one that seems to be invading your space which gives you the right to speak up and directly talk to him about it.
good luck, and be safe! it's always a good thing to be cautious, but don't be afraid :)
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