azrob, the best advice I can give you is to see a therapist/mc on your own to sort through all this. It is VERY complicated. He/she may give you better insight and a plan.
Personally, I would let this one go and I would run the other way. I can also 'understand' you want to stay married but I don't see any benefit in it for you.
I wish you the best of luck.
I started seeing one about 8 months ago hoping he could give me tools to better handle her need to be poly. He kinda didnt do that. Thanks though...I owe it to my kids to play this out, im just looking for any kind of advice here to help. I keep thikning im missing something here.