There's enough documented cases where we KNOW this is the case to think this is likely true for a very large proportion of them. Dick Francis is a major case in point; his wife wrote most of "his" books.
I am not a man and I handle all the domestic stuff but if my wife died I'd probably drown myself in a bottle.
I'm sure it doesn't help when you can't take care of yourself but if losing a spouse after decades together doesn't shatter you I'm a but sus about the relationship tbh. I've got friends and family but absolutely nothing compares to the love I have for her.