Divorce is unsettling. From your set routines and patterns of behavior, to the allocation of your assets for your retirement accounts. You have to dissolve your marriage and all of the formal contractual arrangements that you created during your time with your spouse.
You need to separate your bank accounts, you need to sell your family home or pay off the mortgage and obtain a new mortgage for only one spouse. You need to draft a new will and create a new estate plan that will provide the structure for your life without your spouse as you move towards retirement.