I am not sure if the OW knows he has an EA with her. I do believe she likes the attention though. I am not sure how much her H knows about what they are doing. I do know that my H has hung out with her and her H a few times. I can't see how he would be okay with my H being over there all the time. It makes me wonder if that is what prompted my H to come back that first time.
My wife is friends with her OM's wife. The OM's wife actually seems to try to keep them together. It was very confusing for me at first. It took a good MC (she became my IC) to help me figure things out. It's very weird, but there's a history of child sexual abuse (my wife, the OM and his wife) and that seems to be a factor.
That's the very condensed version of my situation, but I hope it helps. If you're H is trying to play the "you're just jealous" or "just friends" card, don't go for it. If he's putting the OW ahead of you, then he's having an emotional affair.
