I would imagine there is a fair amount of guilt in her agreeing to such financial terms. She knows she has hurt you and her children, deep down she probably feels she has misled you, b/c she married you and promised you forever and has now reneged on that deal. Hope you know what I mean. So that is probably part of it.
You will love again b/c you are a great man. I am sad for the kids. I know it isn't your choice for it to be this way, and it isn't their choice, either. Thinking of you always...