that's how many men are, thinking in a practical way: something's wrong = i have to fix it, as when something breaks around the house. and when they can't, they feel helpless and this can be devastating for them, and kind of adds up to the loss.
the fact is, it is not their task to fix it. no one can fix this. maybe explain him that when you cry, you just need to cry and he should just allow you to cry your heart out and be there for you when you do. that makes you, your grief and your emotions feel accepted, understood and acknowledged, and that's already a lot when you go through a loss like this.
