Is this behaviour purposeful or natural?

I don’t want to discern like feelings or anything, just if i’m genuinely delusional here or not because it’s been kind of driving me crazy 😭

This guy I have known in class, he’s nice and would wave at me and all, we just stick to classwork talks. I’ve sat beside him like 2 times, rest were just waves. Now all of a sudden, after the new semester class started, he’s been: Avoiding eye contact by pretending to not see me or lowering his gaze I guess, switching paths/delaying himself to avoid me, one time he could’ve sat beside me but waved and sat like 5 seats down, and once he saw me at the bus station and he genuinely spedup and went outside in -30 weather warning (no one else was outside, neither was his bus)

Now I guess he can just be polite, but I was wondering, is this normal avoidance if they don’t want to talk? Idk if just feels a bit odd and personal but if I’m over reading lol