I know in my own marriage I stayed in it to provide my son with what I thought was a stable background and to give him what I thought was the family life a child should have with two parents. But that isn't always the best way and it took me taking my son to therapy after the divorce to really see it.
If a star or studio chief or any other great movie personages find themselves sitting among a lot of nobodies they get frightened - as if somebody was trying to demote them.