All of my experiences are from the outside looking in.
was super destructive with a single domineering individual that led to a divorce and a suicide.
was fantasy fulfillment and led to a great deal of strife.
was kinda positive in that it lasted until the one partner passed and the relationship sorta dissolved. Which is sad but understandable.
So outside of highschool i have seen 3 kicks at the can with only one “success”. The failed relationships did so in spectacular fashion which is why i know far more about them due to their violence.