Overwhelmed and Guilt Ridden in My Life

So we told the kids we're splitting up on April vacation. And they took it really, really well. So well I'm waiting for the other shoe to drop and hoping for the best. But today I'm feeling weepy and overwhelmed and guilty. He moves out a week from tomorrow and I'm feeling bad. that he has to move out, that he has to buy so much stuff, that he won't be seeing the kids every day. Why am I feeling guilty? It happens. Right? And everyone survives okay. And it's amicable and it just didn't work, and we tried. Right? I lost it in the shower today and cried my heart out which....probably was good, because I hadn't done that in a while, and it was necessary. But I really do feel awful.
The anticipation of him moving, and how the kids will be, how i will be, is killing me. I just need it to happen, so that our new normal can begin and we can start to define our next chapter.