I dunno about that. You can tell a lot by how someone treats a person they dislike and how they treat those they have nothing to gain from.
A vicious person will be vicious in more places than divorce court.
You can also tell a lot about a spouse by how she treats her family.
My wife and Ihave been together for 30 years and it keeps getting better with us. Couldn’t imagine not growing old together. Sad reading about the horrors others have gone through.