Graves was always a Mama's Boy. When thing with his father weren't good at home his mom was always there for him. After he joined the army he had less time to visit his mother. It affected him as they had a close relationship.

Than he met you and he instantly fell in love with you as you reminded him of her and always comforted him when he needed it just like she did.

During recent mission he lost some of his shadows. He was mad and felt guilty about his man's death so he decided to see you.