My wife took this to the next level. She would install a messaging app when it was safe, message with the OM, and then not only delete the messages, but then uninstalled the messaging app that was used. Do not underestimate the lengths a cheating spouse will go to in order to hide their activities.
Wow. Is your story documented somewhere? How are things going now?
You can read through any poster's situation: 1) Navigate to the user's profile by clicking on their screenname or "View Profile" in the drop down 2) Click on the linked number of "Total Posts" 3) Click on "Threads Created".