BF Hasnt texted me in a week?

What do i do? I told him last thursday i would be on vacation til monday and then i'd talk to him and now ive been calling him and texting him and he hasnt replied back at all. Im sure if he was on vacation he wouldve told me. He really likes me and has liked me for a very long time and we havent been going out that long. The thing is he lives 5 hours away and calling each other's cell and texting is our only communication besides Facebook. Its like he's disappeared! I dont know what i did wrong! :( What should i do?