My wife and I do snoop each other's text message sometime. Careful what you say that can lead your partner think you're up to something. Snooping happens while still in texting with friends or family member. When I'm still texting and I handed over to her to read, she scrolls up and down to see what he and I were saying. I did the same. I always have a habit of delete or End Conversation after texting in order to keep memory usage low. Some people are stupid enough to leave text or email piling up in their mobile device to the max enough to encourage curiousity.
Best advice: If you really want to keep text message for long time, just foward it to your own email or save it to "notepad" if there's nothing personal in it. If it's personal, foward to your private Email (make sure it's not sync with your mobile deivce).
When you're finished with text messaging, just Delete or End conversation. Don't leave it piled up too long that it'll eat up device's memory or cause device not to receive any more message. Develop habit to be a Minimalist (I cleaned out lot of unneccessary craps from my BB device with MaxMem3, I saved 20mb worth!! My bb curve now have 51mb free space! and still have useful apps in it such as Midnight pool, Pacman, Mini Opera ect...). Also if you can't delete text message cuz you need to keep it. Just lock the mobile device w/ password.
Catty