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If you've been as radically honest about your inappropriate relationship when talking with your MIL and those others you've exposed to, I think the complications can be managed.

H had already exposed to pretty much everyone ... long after the A was over. Either way, I have been radically honest with MIL - since she's a therapist, she's been very helpful in dealing with my inner growth as well as setting boundaries for my H.

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Additionally, it could be said his was the worst betrayal because he knew first hand the depth of the emotional impact it would cause.

I would agree with this entirely. His excuse is that in his mind, we weren't married anymore from the moment he found out about my A.

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BTW, any progress with finding WH an IC?

I haven't had any time! This week has been crazy! I was planning on working on that some tomorrow, since I don't have to work.