How to completely delete message from iphone?

My boyfriend has found a way to find every text message thats ever been on my iphone.everything has been from the past but i'm tired of hearing about stuff that doesn't even envolve us. I want to know how i can COMPLETELY delete the messages saved on the iphone period! Please help to end these past arguments so we can start new ones.

In case. The only option available here is just restore your phone as a new device, or: Settings>General>Reset>Erase All Content & Settings.

I can even suggest three such apps which claim to do that work for you effectively, but i haven't tried any of them personally so cnt assure anything. The apps are:

- iErase: Zero Free Space - US$2.99
- ProtectStar iShredder Pro - $5.99
- SecureWipe - $3.99
All three of them are available on iTunes.

Hope this helps you.

Well as Sophie says, you can just erase your entire phone and restore it back to factory settings.

However be mindful that this may delete all you other data. I would suggest that you save your contacts, photos or other important data somwhere before taking the step above. You can icloud to synchronise the stuff that you want ( not backup, just synchronise)