Yes, it's sad that it has come to this, but come to this it has. You wouldn't be human if it weren't painful.
You made a difficult decision, and you didn't come to it lightly. You didn't just decide, on a whim, to end your marriage. Even if you can't call them to mind right now, you had good reasons for your decision.
If he recovers, and your relationship heals, you can remarry him. If not, well, you have that much of a start on your new life.
Go ahead and mourn. Do your grieving. Pray for him. And take good care of yourself.