Broken:
Sorry to hear about your situation. These forums are a wonderful place--many wonderful, caring people who have been in similar spots. I spent a lot of time here and it helped me immensely.

You will come to see, if you haven't already, that there is little to nothing you can do to control her or where this goes.

But you can control yourself, so use this crisis to learn and grow for yourself and your kids. It's so very hard to deal with, but in time you will, if you are open to it, learn and grow. If you can get to that point, you will see that this was worthwhile. Bitterness and anger are natural. Getting beyond them, on your own terms and on your own timeline, is essential for your well being.

Protect yourself financially. Don't let her walk over you or ruin you.

At the same time, however, deepen your compassion for her and yourself. I found that once I could do that, getting through this became easier.