Because so far from what you say it's a game of despair.Everything one has lived through just to say goodbye.It looks like a similar game I used to play:The creature one made love to at the very end died,and everything depended on how it was treated such had an incarnation after its death in the sense the ghost could be happy or sad and the like.Parting with the Ori is something similar for me,I haven't finished the game but I feel the same as with that game thinking about the end