All of this is much easier said than done. You still love her so you don't want to something that will screw it up worse, but really can it get much worse for you, you need to make it just as bad for her. I've read nmmng and it was like reading a book about myself.
The only problem with all of this, the one thing that really sticks a wrench in everything is the kids. 'How can i force my children's mother out of the house'. Just remember that you have a large part in the marriage problems but you have gone above and beyond on trying to fix it, this is her choice, she wants the D, she wants relationships with other men, She can't possibly expect you to be ok with all this. You need to use you position ontop of the high horse to dictate things. If she doesn't want to follow you rules/plans, then she is on her own, after all that is what she wants. You will take care of yourself and your kids, and you will take care of a loving dedicated wife if that ever returns.