My H is seeing a co worker as well, and informed me that he may date another co worker (think he just threw that one in for spite). Having an affair is bad enough, but I do agree that it is cheating if you are not divorced, and I also agree that that has become the new rule so these WAS can justify the behavior. You are fortunate that he still gives a crap to look at your cell phone and that he would blow his top if YOU dated. At this point I think mine would use it and say "AH-HA! SEEE, I told you she couln't wait. I've only been gone months." Meanwhile he is seeing/helping OW and goingout to bars and biker things with his friends. He has informed me some time ago that he likes his life just the way it is, and now I am looking at divorce papers.