Send Me No Flowers (1964) on Netflix

A hypochondriac believes he is dying and makes plans for his wife which she discovers and misunderstands.

At one of his many visits to his doctor, hypochondriac George Kimball mistakes a dying man's diagnosis for his own and believes he only has about two more weeks to live. Wanting to take care of his wife Judy, he doesn't tell her and tries to find her a new husband. When he finally does tell her, she quickly finds out he's not dying at all (while he doesn't) and she believes it's just a lame excuse to hide an affair, so she decides to leave him.

—Leon Wolters <wolters@strw.LeidenUniv.nl>

Judy Kimball quietly humors her husband George's chronic hypochondria, On his latest visit to his GP,, he is told the's one the doctor's healthiest patients. But when George overhears Dr. Morrissey talking to George's cardiologist about another patient's terminal heart problem, George assumes they're talking about him. He doesn't plan on telling Judy the news, but decides that top thing to do with his remaining time is to find her a replacement husband

—Huggo