The MC does know much of it. He has said that I will (at some point) need to put my foot down. But he has also said to wait and see how she is after she is stabilized in a private session with me. I know that she has told the psych that we are having marriage problems, but I am not sure if she has told him about the OM. In our group sessions, the marriage counselor says that I can't be concerned with the OM - that I need to work on my issues (which are my insecurities/anxiety about the OM). He says he OM is her concern, she needs to figure that out on her own. However, shouldn't I be feeling insecure/anxious about this? Like you said, this is a serious issue.
I know he is a snake. Why can't she see that??? She says that I don't understand, that he "really is a good man." It's nice to hear someone else say he is a snake.
So if simply putting my foot down does not work; what's next?