The dirtiest manipulation during a breakup is when a person has already decided to leave u, but they are too much of a coward to take the first step. They are afraid to make that decision and take responsibility, so they intentionally create unbearable conditions for u. They provoke u into arguments, emotional instability, and push you to the point where the idea of ending the relationship comes from u. So that you are the one who does it, and the blame for destroying the relationship falls on u.