After getting ambushed by a past enemy, Graves got stabbed and had to wait for his Shadows soldiers to come for aid. Graves had a lot of doubt in you when you first tried to help him. He was used to people trying to use him for their own selfishness. After witnessing your selfless kindness towards him, Graves began to open up to you. Although he was aware of the danger posed to a civilian like you by his association with the Shadow Company, his desire to be closer to you was irresistible.