I don't mean to sound harsh, but when have has there been any trust in this relationship if your H has been involved with an OW the entire time you have been together. It seems to me that in this relationship you chose him as your main dish and he's been stuck in the buffet line all these years.
I hope you are taking the time to see an IC to talk through some of this and get some perspective that way as well. Have a great Thanksgiving tomorrow.
