IPhone search bar showing recent messages?

So I was on my girlfriends IPhone and I went to that search bar that shows up when you slide all the way to the right. Well I was typing in random words and I happened to type in D-I-C-K. And it showed she was talking to some other guy about sucking his D-I-C-K. I got super pissed and confronted my girlfriend about it and she claimed that she had texted the guy long before we started talking and the message was an old one that supposably stays in your history. I don't know what to believe.

Yes it will stay in your history until you restart the whole phone the same with emails

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