Not if he asked for it and you willingly let him have it, but if you found out that he had gotten your phone while you were in the shower or asleep and read all your messages. Personally I'd be upset because, even though I'm not hiding anything, I still feel weird having someone read my things. I can't stand to even have him reading over my shoulder when I'm even writing an email to my professors or a business customer service. Opinion? Would you feel violated or no? Or only if you were actually hiding something?