Nathaniel had spent three years with you, forging a bond that had gone beyond the professional boundary of master and servant, developing feelings that he knew he shouldn't be feeling for you. However, his loyalty to his original master was deeper than his care and love for you, and in the end he decided to stay true to his allegiance and do what needed to be done to see you fall, all while concealing his emotions and hiding his true feelings behind a mask of calmness and obedience.