I have a scene in the beginning of one of my manuscripts where the wife is thinking of murdering her husband. Her husband had been acting crazy for months. Obsessed with building a bomb shelter, pouring all their money into it. It so consumes him the wife is living in fear of his mania. My critique group thought it was a bit extreme to have the wife thinking of murder instead of..say...therapy.
My thoughts are that just sending him to therapy would be a boring book. And she doesn't actually kill him in the book. (that's taken care of by forces beyond her control) But how weird would your significant other have to get before you'd think of divorce? If your "other" started obsessing over something strange, drained your saving account and spent every waking hour on this obsession. Got so bad you could see something in his eyes that scared you.... What would you do? How long would you put up with it?
I'm not saying murder is the answer (we'll save that for the book) but what about divorce? Or just leaving? Kicking him out?