I think you are grieving the loss of your marriage.. the loss of it all.. or all you thought you had.
It is OK to cry. No matter the distance, when the paperwork of a divorce becomes final it is another milestone.. another reminder..
I cried too when mine was final, even tho I had been away from him for a year. I cried when he died two years later, and I never let anyone know that. Thetears were mine and for me to heal.