My 'dp' works away some nights. Found an email to colleague from him last week saying if she ever fancies a run after work to join him. He does go running after he checks into the hotel. Obviously I have trailed through his emails to find this as a while ago I was a bit suss about something. I think it is inappropriate - I know he'll say it's innocent. It's what it could lead to that worries me. Should I fess up and say what I've found?