I believe it is still true today - what would a divorced consort gain? Of course housing and enough money to have a carefree life but no role, constant attention of the press - almost impossible for CP/Monarch couple to divorce with kids still being minors, still difficult with adult kids. As in Sofias case - society was different back then - even today, it would be the consort who loses out on almost everything, not the born royal. Apart from the time they have devoted and invitest, they lose role, circle of friends, children are torn, wont get privacy back - my point is, even today, with cheating frowned upon by society, I would think not once but many, many times before pulling the plug if I was the consort in a royal marriage.