Why would a guy push a girl that wants to get to know him away?

baddiska
So there's a guy that I've had a crush on, he's in the same year as me, just a different class. Apparently he doesn't really talk to anyone and has no friends, every time I see him in the hallway he's on his phone looking a bit awkward - always. Also, he doesn't have any social media. I came up to him at school once, just to have a quick chat with him, I introduced myself, said that he looks friendly and asked for his messenger. He avoided eye contact and seemed super nervous. A few days later I texted him saying hi and asking how his weekend went - he ignored my messages, it's been almost a month and he still hasn't replied. I don't really understand his behaviour, nobody really seems to care about him in his class and I just wanted to get to know him. After that I said hi to him at school and he replied. We don't even have to get close, but I thought it would be nice to just talk from time to time - I never had such a problem with other people at my school, sometimes we just say hi to each other and that's it, but with him it's different. I'd say that I'm pretty attractive, dress well - guys from his class find me pretty. So what might be a reason for that? Is it because of his shyness? Should I just leave him alone? Doesn't he realize that ghosting and ignoring another person is just rude and makes me overanalyze myself? Why is he acting like that?
Why would a guy push a girl that wants to get to know him away?
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