The decision "If she PAs, I will divorce her" is a boundary. It controls Peter's behavior.

The announcement "If you PA again, I'll divorce you!" is not needed to control Peter's behavior nor to enforce his boundary. The primary reason he would tell her is to attempt to influence or manipulate her.

Originally Posted by HappyPanda
Most boundaries (yours and other people’s) aren’t explicitly stated. Usually, there’s no need to voice a boundary unless it’s overstepped or violated.

Originally Posted by GoodMenProject
When you cause a person to act out of fear—the fear of retribution—you turn that person into a slave. Threats make people give in to your demands when they don’t want to, because you make the pain of refusing greater than the pain of giving in.