Your story sounds somewhat similar to mine, but then again, I think a lot of what WAS say is script. My wife told me for 18 months she wanted a divorce, and even moved out a few weeks ago. She's told me so many times "if you were this person 5 years ago, we'd be in a happy marriage" and things of that sort. She constantly refers to me in terms of "the old you" and "the new you." I've heard the "nothing left" a bunch of times too.
With all that said, my W moved back in after one week....she said it was just for the week, but a few days in she brought her clothes back, today she put her clothes back in the drawers, and we're talking and touching every day.
This isn't to say we're fixed...we are not, far from it. We've only talked about R one night, and it was a fight, and she dropped the bomb again. Otherwise, we're in a pleasant limbo so to speak. I'm content to continue working on me, and letting her sort her own stuff out in her own way and at her own speed. But my point is, they can flip on a dime....
With that said, best advice I have is to embrace the 180s, GAL and be as pleasant as reasonably possible. Be upbeat and happy, look good when you see her, and focus on your kids. You can't convince her of anything right now so don't waste your efforts.