At this point to demand that he remove himself from this situation would be a fatal mistake.
M,
I couldn't disagree more. In fact, I think the opposite is true.
I warned you about the two of them before, when no one else was and everyone (including you) were dismissing the thought that there was OW. I was right.
This is your marriage, and you're in a tough spot, and you obviously have to do what YOU think is best. I have some serious personal family stuff going on right now with D20 that needs my attention, so I won't be around much for a little while.