As your behavior points out this individual only truly has power over you when you give it to him. Why wait till he pushes your buttons until you stand up to him. The best approach would not be to empower him, but to really have it out and lay out the ground rules, violation of which will cause you to cause you to ignore him totally. Does this person have the power to preclude you to ignore him as this is what it will probably come to as he will not apparently change his behavior meaning the only one who can change the behavioral interchange is you and this will free you up. Best wishes and good luck.
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