You cannot be devastated if Stevens and NYU were your only schools. the ex isn’t even obligated to do the NCP part but even if he did, what difference would it have made? What uni does your college DD attend?
Stevens half off scholarship is only half off tuition, the COA is @ 70 000. Where are you getting 44K a year? Your Ex isn’t the problem here at all. What is your FAFSA EFC?