From an enduring column by Ben Stein about love and economics:
High-quality bonds consistently yield more return than junk, and so it is with high-quality love. As for the returns on bonds, I know that my comment will come as a surprise to people who have been brainwashed into thinking that junk bonds are free money. They aren’t. The data from the maven of bond research, W. Braddock Hickman, shows that junk debt outperforms high quality only in rare situations, because of the default risk.
In love, the data is even clearer. Stay with high-quality human beings. And once you find that you are in a junk relationship, sell immediately. Junk situations can look appealing and seductive, but junk is junk. Be wary of it unless you control the market.