its probably just him needing space. i dont know what it is you guys normally talk about but sometimes guys just want to talk about guy stuff. its also hard when its long distance. especially if you talk every day. sometimes a guy just runs out of things to talk about and it turns him off from talking for a while. i know thats how i am anyway. sometimes a guy just wants to be away for a while, watch sports and play games or just do what he normally does for a while to get recharged, and then usually we get back to normal. at least, thats how i am. doing the routine can get pretty boring and then we feel like we are forcing ourselves to talk.

or... he could have found someone else o_o. i doubt that though. or at least i hope thats not the case. good luck!