Why wont he talk to me?

Theres this boy i txt/talk on fb to, i and hes just suddenly stpoped tlkin to me, and when i was up in hampton with people near his, he walked past and didnt even say anything to me!! why is this?? i though he REALLY liked me(in that way). is this just a boy thing or what? i cant think of anyways ive irratated/offended him!! what is it?? grrrr