Been married and divorced twice.
First time at age 18 to someone who turned out to be a nutter (it lasted just over a year), second time aged 35 and it lasted 12. Just complete incompatibility with that one, although the split was amicable in the end.
I honestly find it incredibly hard to live with anyone 24/7 if I'm honest. Prefer my own space.
Yet I look at my Aunt and her husband, 58 years married, and still very close and happy. Soulmates. However, I think this will become more rare. People are much more demanding these days and less inclined to compromise