Because love was not the answer to every question. Because real love meant sacrifice. Sometimes love means letting go.
This was what love meant after all: sacrifice and selflessness. It did not mean hearts and flowers and a happy ending, but the knowledge that another's well-being is more important than one's own.
Do not cry for me, Azrael. Do not waste your tears. You made your decision. And this is mine. Sacrifice seems to be my destiny. A funny thing for a selfish man, isn't it? They always called me weak back then...