First and foremost--no matter how dark it gets, never never lay down and die. Second, don't believe anything they say and only half of what they do. Make it clear to her that you are not interested in divorce or anything that will make that happen. If you are not interested in going to a mediator, tell her simply. No. I will not go to a mediator. I will continue to live my life but I will not help you in ending soemthing I think is wonderful and has the potential to be even more wonderful....the envy of the neighborhood. Forget the past. Concentrate on you today so that maybe she'll be a part of your future. You can have your freak out days. But I do PROMISE YOU, there will be more but then you manage, you get a hold of the situation and you'll be amazed at how you'll be handling all of this not that far from now. Don't think that because she seems to be talking divorce that you have to help and be nice about it. You do have to be nice, but you don't have to help her with this crazy idea of D. Make it clear, you're not interested in that.