Why did my crush hide when he saw me today?

It’s been a while that i’ve noticed how my crush has been acting weird and today he hide himself as soon as he saw me i still can’t understand why? by the way we rarely talk so it’s not like we’re friends or something he always says hi when he sees me sometimes even ask really weird random questions just to have little conversation? make me wonder sometimes if he’s just nice with everyone or he think we’re friends? I don’t think he knows that i like him cuz only one friend of mine knows about him..
Why did my crush hide when he saw me today?
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