You weren't snooping. You simply needed an email address of someone you knew your wife had in her contacts list on her iPhone. But when you entered her password to access her screen, you found this. Apparently, your wife had recorded a little extra-curricular activity with someone at work. You didn't need to see him to know it was a him, or to know what he was doing to your wife. All you knew was that you never did this to her.