FWIW, I do think we can work it out amicably. As U and a few others have mentioned, we don't have a lot of complicating factors. No kids, a majority of my illiquid assets were held before marriage, and our salaries are equivocal so there's no support.
But to O's point, yeah, I would sort of feel blindsided, on top of the frustration that I feel about her saying for a YEAR that she's needed to get a legal separation in place. It'd be a mixture of anger and hurt, but I honestly don't know which would be more right now.
I'm talking to my lawyer tomorrow morning; I might ask her what she recommends I do in that situation.