I think that's an excellent response. Confident, respectful, soo full of "I will survive."
If this is NOT what he wants, and he's just firing some sort of MLC shot across your bow, it's the right response I think. If it IS what he truly wants, it's also the right response as his mind is made up anyway. The only thing I might have added is a "I still do not want a divorce, but if this is what you want, I'm sorry you feel that way, and I had no idea that you had . . . " etc.
