My father has been married 5 times. Twice to the same woman.
My mother left him for OM
2nd wife was a mistake (aiming for the opposite of what he had w my mother) He left her.
3rd and 4th wife he was with for 15 years with a split about 5 years in where they were apart for 2 years they both said the day their degree nichi came through they both thought " what have I done" and they got back together. 2nd time it lasted 10 years. Mutual decision to split. They are still friendly (though no longer live close to each other)
Both say they remarried due to my fathers' pension that if anything happened to him would sustain her and her children.
Wife no 5 he was in his 60th met what I think was the right woman for him and they had 9 happy years together until she just didn't wake up one morning. He wants to be buried next to her.
For many years I felt no 2 3&4 didn't work because he had never truly gotten over my mother. (he did not want the divorce she pushed it) However, when I saw him, w wife, no 5 I saw a side of him I had never seen. He was content happy and settled. I don't recall that with the ones in between.
I will also add here my father is autistic so I do suspect over the years he would have been difficult to live with.
I have never judged him on his marriages. I didn't attend any of them though as with no 2 & 3 they invited no one and by no 4 and 5 I was living in a different country.
If anything I have always said that it means he is the eternal optimist.