How to remove a keylogger off my iphone 4?

I have high suspicions that there's a keylogging software on my iphone.
My ex, had to of installed it on my phone while we were still together, and I want to put an end to it, of being watched constantly. I'm not sure though, how to go about of removing it off my phone, so if anybody could help me out I would appreciate it, thanks.

Download Avast for Mobile or any other antivirus compatible with iPhone:
http://www.avast.com/...r-fr/index

Avast for mobile

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