I don't agree with you. sure in the beginning it seemed out of pity, but right now he really loves daigo, either that or he still can't reject the crying daigo.
But you know it feels like he just felt compelled to be with him with everyone around him and daigo being you are livers and he shouldn't be alone or he'll die soo dunno about it
even i felt he accepted Deigo of pity but story ending was really good...