I said Hi to my crush and he is starting to avoid me now?

(remaking because i forgot to detail) So me and this guy like each other. He doesn’t know I like him but I know he does because he’s told so many people at school and the way he acts when we are around each other. He is usually very obsessed with me like he follows me around in school and likes to stare at me all day. So on Friday while i was walking past him, for the first time I said “Hey” to him and he said “Hi” back to me and nodded his head up at me. Then later on the bus he tried to play fight a friend for a seat so he can sit on my side where I sit but the friend didn’t let him. So today i’m thinking, since I showed him i’m friendly and there’s nothing to be scared of, that he would try to converse with me. I didn’t see him all day at school until the end of the day at the bus which never happens because he at least see each other once in the halls. He intentionally goes to where he’ll know I’ll be. It feels like he’s purposely avoiding me and acting like I don’t exist which is confusing to me.
Im trying not to overthink but I can’t help it, Im scared I gave him the ick or something when I spoke to him and I regret it so bad. I just hope he didn’t randomly lose feelings and find me ugly all a sudden or smth. Any advice as to why this is happening would be appreciated. 💗

I said Hi to my crush and he is starting to avoid me now?
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