You're both going through grief.
Your lives have changed permanently, and it will take time to go through resolution and come to grips with it, and there's a lot of stress.
It will take time for one....one thing that might help is admitting you are both struggling with this - that alone can be very difficult. He may not want to talk about it, pretend it doesn't exist, have misgivings, regrets, anger, sorrow, denial - all are normal parts of grief.
I would reccomend counseling, and taking some time to realize what you're facing, put together some plans, pull together, put things in perspective, and realize this is going to take time.