Depression is probably the culprit of such a decision. If counseling did not work, I wouldn't take drugs but would certainly
try natural remedies like St. John's Wort, B vitamins ( especially niacin) and Omega 3's. I heard long ago that vitamin deficiency causes many health problems, including mental health. So first thing is to address nutritional needs.
The other cause of depression is too much self focus. Get off yourself, go out out and help someone, work, be more active, don't remain in house doing nothing - get out in the sun, exercise.
Here's another product I came across:
That product above may really change his attitude along with good nutrition and exercise.
Besides much prayer, at least try those things things for a couple months before you trash your ( their) marriage. And here is a strong reason to try these things, it is not only to save your marriage but to restore your general well being for life.
If he doesn't have a change of heart, then with no young children involved, it's less complicated.
Sell everything and divide 50/50
... unless there are cash savings that are equal to the value of the home, in which case whoever wants it can pay off their spouse for it.