Look, you know what stinks even more if you mix it? Yeah you do, so don't!!!
The OW is his problem and do not go on making it your own. If he's hellbent on contacting her, he WILL FIND a way, frankly speaking, he might be romancing her in the copy room as we speak, and you cannot do anything.
So for PEte's sake, give it a rest. Slap a boundary on his behaviour if it affects you, otherwise do not.
So take your eyes off him and go on with your life, let him decide if he want's to join you...
