He still needs OW in his life. She is good for him. Its not hurting me, I need to just get over it.
I'm sorry, but this almost made me laugh out loud. He just doesn't see why you're bothered by this? Why then do I suspect he would NOT be as sanguine if the shoe was on the other foot and YOU were carrying on an affair right under his nose???
It'll be interesting to see what happens in the MC - I'd like to see the counselor's response to that. make sure you share that part.
That being said - unless the counselor can get through to him that this is not ok or appropriate - it may well be time to allow him to feel the consequences of his actions. You are not a doormat and there's no reason to "endure" such inappropriate behavior - and it sets a bad example for your kids.