I think that I have some of the same fears that you do about hardening my heart, but at the end of the day, it's time to live for ourselves and ride it out the way that we see fit. We cannot worry about "what if's" right now. We need to live the day and try to be better.
Your W absolutely believes she is in control. I think, though, you are yanking it back and I couldn't be more proud of you!!!! Someone needs to introduce her to reality and the fact that if she decides to go through with this divorce, you will still be okay and will live a great life. You don't need her to be happy. You would like her to be happy, but that's a whole different matter altogether.