Is it possible to hack a iPhone 5?

Ok so just recently I think my new iPhone 5 was hacked, a friend of mine has been accusing me of text messages that I didn't send any help? My phone stays on me and very little people use it, but even when they do no one sends any texts without me reading them first. I just don't understand what's going on.

No. Your friend could just be messing with you. It's very unlikely that your phone would be hacked and sending people messages. But, If you are worried, bring it to an Apple store and they will help you out with it! As of right now, turn your phone off for a few minutes, and then turn it back on. But don't worry about it. Everything is fine!