I’m faithful

I’ve been with my wife five years married for two. About a year ago my ex reached out to me. Calling private, now I know that I shouldn’t answered it, or even entering the conversations. But during that, me and my wife have went 16 months without you know what. My ex sent me her pictures. I kept the pictures. Today my wife found the pictures in my email. I did not sleep with this lady or anyone else for that matter. My only girlfriend has been palm. How do I convince my wife that I’m faithful??