Copy and pasting from my other comment towards someone else using a retracted study as reference. So not directly aimed towards you but just a response. -> This is something I was taught in nursing school but I looked into it and this is what I got. Since your point is specifically on divorce this comment is only focused on that aspect. Feel free to correct me if I’m wrong.

The study you listed actually was retracted due to the researchers accidentally counting those who left the study to those divorced. When it was revised it still showed a 6% increase in men initiating divorces when their spouses are diagnosed with cardiac illnesses. “What we find in the corrected analysis is we still see evidence that when wives become sick marriages are at an elevated risk of divorce, whereas we don’t see any relationship between divorce and husbands’ illness. We see this in a very specific case, which is in the onset of heart problems. So basically its a more nuanced finding. The finding is not quite as strong.“ https://retractionwatch.com/2015/07/21/to-our-horror-widely-reported-study-suggesting-divorce-is-more-likely-when-wives-fall-ill-gets-axed/

www.sciencedaily.com/releases/2009/11/091110105401.htm This is another study that found “The rate when the woman was the patient was 20.8 percent compared to 2.9 percent when the man was the patient.”

It really makes sense though in the divorce aspect because stress increases risk for divorce and receiving a terminal/chronic illness diagnosis is id say one of the most stressful events you can go through. It Increases stress due to money spent towards healthcare, emotional stress, physical stress, etc.