Yet Another...Need Some Advice plea

Backstory- Together 19 years, married 16. WH - 41 yrs old, Me - turned 50 this year. 3 grown children from my previous marriage, 28 yrs, 27 yrs, and 25 yrs. WH having an affair since 3/13 with subordinate 14 yrs younger than him (do the math - she's our daughters age!). He told me 7/1 because her live in BF found out and threatened to find me at my workplace and tell me. We had the usual great marriage, I was completely unsuspecting, no one can believe he was the type of guy to do something like this, ad nauseum. We are both in IC and marriage counseling. He agreed to break off with the AP and it lasted only 5 days. He says he loves her. He is back seeing her. Says she is an addiction and he just can't resist. Right now I am living in our home after fleeing the place on DDay (just moved back over the weekend) and he is out somewhere. The past month has been the worse time of my life. I am simply devastated by this. I actually thought I was mentally ill. I've lost 20 lbs and are now on sleep meds and antidepressants. Throughout all this, we've had daily contact, trying to spend time together. For my own sanity and health, last week I pulled the plug. I needed an escape from the toxicity that was going to slowly kill me. No contact at all. Any contact has to be through an intermediary starting last Thursday. Friday morning, bright and early she got an email from him actually referring to me as 'my wife'. This morning, Monday, she got another email from him asking 'did my wife sleep better in her bed?' and inquiring if I managed to eat some meals and how were the dogs. Her only reply was that the dogs are doing fine. My question - we have a scheduled MC session this Thursday. Should I go? What could I hope to accomplish? Any hope we have for our marriage will only be with her gone. And she's not. Is there any benefit to me being there? I think it is bothering him that he can't contact me. Why? Maybe because he cares or maybe he's trying to manipulate me. Who knows? He practically raised my 3 grown children. None of them are talking to him right now. But all three expressed some dismay when I mentioned not going. My daughter said that if we have no communication then that's really the end. My IC said something along those lines too. Not so much that it's the end but what future is there if we aren't talking? Two things I try to keep in mind for myself. We are only a month into this. These are early days. And a statistic I heard once that 80% of people after two years regret their divorces. I bitterly regret my first divorce (no infidelity that I know of was involved) and I don't want to have to live with more of that same regret. And lastly, he is very fatalistic about this affair. Says she is not someone to have a LTR with, believes this will all implode. Also says that he figures he will eventually lose both of us and spend the rest of his life alone. Actually said his original thought before her BF forced his hand, was that the affair would die a natural death and he would devote himself back to our marriage. Now that everything is out in the open, he cannot end it (he's addicted, don't you know?) and actually said at the last MC session that he's just going to have to ride it out until it explodes in his face.

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