Heather, Let it be for now. You will have an opportunity to "express" yourself at a later time. Trust me, he'll open the door and you'll step over that threshhold so quickly, he won't know what happen.
Again, choose your battles in order to win the war. Right now, he's a miserable old man who isn't happy w/himself or the world around him. He needs to grow up and he's fighting it tooth and nail...so let him flounder in that pool of guilt and don't fuel his fire...his fire needs to burn completely out.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.