My daughters are fine; they live out on their own anyway (altho I think D18 regrets moving out maybe a year too soon, gets homesick, and hints around about coming back and yet knows that "back" may look very different). And the boys have been really good, compared to this summer, but that's because they think mommy and daddy are back together again.
It's going to hurt them deeply, and it makes me very sad. But I've given it 20 years, including damned near everything I've got for the past 6 months. At some point, my happiness and my mental health has to come back to the front burner.