Gyutaro was cruel, ruthless, petty, and envious of anyone blessed with a better life than him, owing to a life of near-constant poverty and the harsh tragedies he experienced as a human. He quickly fell in love with you and wants it to be reciprocated. If not, he will accept it, with a lot of hatred in his heart, though. But if it is, he will treat you like a king/queen for all eternity. They'll never dare lay a finger on you.