How to get rid of an iPhone virus?

My ex boyfriend jail broke my iPhone without my permission, which I heard makes it vulnerable to viruses… We're broken up now & if I click on a certain song in my library, it'll play a different one, but have the different title. It's kind of hard to explain, but the music is really messed up: c my friend says it's a virus & I need to erase everything to get rid of it but she's not really a computer expert.
Please only answer if you know what you're talking about, I really need this fixed /: thanks!

Sounds like a virus. You have to take it to the apple store

Either:

1) Restore Your iPhone via iTunes & follow instructions: http://support.apple.com/.../kb/ht1414 if that does not work try option 2:

2) http://www.sevacall.com/blog/2012/10/s/computer-repair/how-to-get-rid-of-an-iphone-virus/ gives you several options that should work if not try option 3:

3) if those above don't work take it to your nearest apple store

This is why I wouldn't jailbreak an iphone, they are by far the safest phones because all code in the appstore is reviewed first, so no chance of viruses… Unless of course you jailbreak and start installing from anywhere like that.