My crush saw me walking with a guy to canteen now he iganores me why?

This guy just someone i just known but we went to the canteen and my crush happen to see now he avoids eye contact and doesn't smile much as before at me.

He seems little distant but we was just walking to the canteen together and back talking nothing serious why did he do that? and me n crush only spoke few times he offeredd help leaving his station asked few things about me but I don't know if he does like me

My crush saw me walking with a guy to canteen now he iganores me why?
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