"Bias"

Belinda and Ken started dating when they were in high school. They met with their four friends twice per month for dinner. Ken was a habitual cheater, and she kept forgiving him until she eventually dumped him. All their female friends stopped speaking to him. After a while, they agreed to talk to him, but he wasn’t allowed to bring any of his women, to dinner. Belinda started dating and she was allowed to bring her date.