I think this is a silly Disney view. I don’t think it’s about the history and the sunk cost specifically, but taking the difficult path to learning compromise, communication, patience and forgiveness. That takes a lot of time, decades at least, and it requires having enough incentive to stay together that you work through the rough patches to the other side where you grow instead of breaking up at the first sign of trouble.

If there’s a correlation between number of partners and divorce rates, it’s because someone is consistently failing to learn how to be a better partner.