Quote from jeffreymgibson
well it was ended that way for the sake of plot only. It was totaly out of character for her to leave that way. All through the story, she was the one that had no problem with the relationship at all. She was super obsessed with sora too, and then we are expected to believe that she just changes in ...
I had to reply to this for the original manga could have kept going but due to a few different laws passed in japan which forbid some genre I assume the author wanted to place an ending on it how ever horrible it was or it would have been left unfinished.