Our marriage weathered the loss just fine. That is not to say there were not issues -- the first one being that my husband was too distressed himself to be my main source of support, and of course as the cliche goes we grieved differently. I cannot express enough the importance for us of getting my grieving support from other sources. Once I did that, I had more to put into my marriage.
To this day, I deeply appreciate all my husband did that first hard year -- working hard, paying the bills, keeping the house going, keeping our surviving child going. So he didn't hold my hand every night and listen to me cry about how much I missed them. It helped him to be distracted with other things. That is OK, others did that. He did all the practical things I didn't have the strength to.
Now, we are closer than ever. Appreciate each other for who you are and what you ARE doing to keep yourselves going. Tell each other what you appreciate. If he's not doing something you need, and you can find other source to fill that spot for a while, consider forgiving him and doing so. Your marriage is not over. Really.
Hope it helps. I know I felt lost without my "best friend" those early days.