Your wife associates OM and her affair with her workplace dude... When she's not at work, the thoughts aren't there...

THis is an ADDICTION, and just like any other it has triggers that drive it... her workplace is one of them... No work, No addiction is triggered... It is there in her head still, but doens't have the drive it does when she's at her workplace... HE works there... She IS going to think of him when she's going there...

This is basic arithmetic