I think the one who found piece was the boy and not the girl, as the initially looks at the girl he fell in love for her, his heart was unquiet, and he thinks the girl is pretty sad, so he decides to brighten up her life with all these gifts, but as the girl starts liking him, he starts to fading away as his demand was being responded by the girl who was falling in love now, so in final she loves him, but now the mission of the boy was concluded hes heart was more calm, because the girl fell in love for him too, he might be dead yes, but only when she finally loves him, he can free now like a bird and peace be brought to his grave, sad love sotry
 "Grey")