How to permanently delete texts on iPhone 4S?

Ok so there's this guy that keeps texting he loves me. My parents look at my phone and go to the home screen and go to the left and type things like love, kids etc and any message someone has sent me with those words in it pop up. My parents are going through my phone soon how can I get rid of it? I have already deleted messages but when they search for that word it shows up.

Every time you press DELETE on a message, the software in the phone automatically sends it to a place where they are marked to be deleted. Then, the next time you SINC with iTunes, the messages will be permanently deleted. But if you don't want to SINC or can't SINC, you can go to SETTINGS>GENERAL>SPOTLIGHT SEARCH and UNCHECK "Messages" and the deleted ones won't show up when searched. You're welcome! You will have finally defeated your parents!

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