Unfortunately I can relate all too well. Some days I think XW is bipolar, that's the only thing that would explain most of this.
Some days XW is very thankful talkative, some days it's like you can just feel the "sharp objects" floating in her voice. No idea why.

I also look and just see a shell of a person I fell in love with. Some times I just have to shake my head and say, "what happened"? As much as I would like to see things go back to where they once were, I see the large "canyon" and think, that would be a bear to overcome. I guess I can't say never, but I don't know if even I would have the guts to take this on.

Sorry, no words of inspiration, just letting you know that your not alone. Keep your wits about you, do what is best, take the higher ground.