My crush pulled away suddenly?

Initially my crush was very jovial now ( during those days I didn't like him later I started liking him) I don't know what's wrong with him he is very formal around me, he wouldn't mind avoiding me if given a chance, the worst part is he talks only when I ask something, while I interact comfortably he is super hesitant to talk... I don't even want him to reciprocate my crush at least I hope him to be normal around me. There are many changes like
He got angry when I thanked him for something now even he started doing the same, he was the one who asked my number and used to text me frequently now only I do that, he is not open about anything to me
I wonder why is he like this, I really need help on this
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Here's the update guys, few days ago he had happened to sit next to me only because his friend told him so, he was very awkward around me, I tried to ease it by asking general questions like his hobbies but he said he doesn't have any, even some other questions also same thing, he was very nervous to sit next to me, fidgeting with his phone, maintaining eye contact only when I was answering the questions that I myself asked (lmao), he's very scared of me I feel like a terrible person
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+1 y
I never called him, he came only because our classmate insisted on it
My crush pulled away suddenly?
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