Maybe I'm overreacting

L
Keep in mind this has never happened before, parties yes, his attitude no. 
My boyfriend is out the country and went to a party. For 7 hours I didn't hear from him. We talk via Facebook messages and they weren't even delivering. This morning he tells me that his phone wasn't dead and he doesn't know what happened. I asked him if he turned it off and he was said "no you fucking shit." so, then I asked what happened and he said "probably your fucking nagging." 
I hadn't nagged. I sent one text then when it didn't go through I got pissy. I just don't understand 7 hours?!?