My friend and i have gradually stopped talking?

on a school trip for a week, i bonded really well with this guy.
Then when we get back to school after the holidays, he acts like i don't exist.
i sometimes catch him looking at me, so i smile at him but then he looks away.

i would just get on with my life, but i guess i'm just sad that i've lost a potential friend.

have i done something obviously wrong? or should i go up and ask him?

thanks (:
 
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