The action was fueled by your hatred towards those who'd inflicted pain upon you. Your goal was to retrieve what was righfully yours. And Jack was the catalyst. Without thinking any further, you'd resurrected him after hundred of years of deep slumber. He was not thrilled by it especially after learning the truth that you wanted to use his power to strengthen your influence and reign. Despite that, he still agreed to be bound to you through a contract that made him your royal mage.