Of course you're going to feel resentment and a lot of other uncomfortable feelings toward W. You've been "giving it your all" and she's giving nothing. Marital vows. Children. All that stuff. It's hard to take. Be patient with YOURSELF now (not her anymore).
And this is I think where the detachment comes in as the hardest lesson of all - to close yourself off from her choices and to truly embrace only your own. If she choses to walk, then all you can do is take care of yourself, and all the feelings that will and do come up.
