Feeling lonely and missing his friends, kills Gray inside which makes him hate himself even more. The anger he had within himself for causing Sibyl to kill herself and breaking her heart drove him to kill other life. His own beloved friend, Basil, who had loved him the most and admired him the most. He turned into a cold-hearted murdered. His obsession about beauty and youth turned him to become insane eventually and drove himself into taking his own life at the in end of the story.
In the end, Dorian Gray couldn't change his fleeting beauty and youth, so he grew old and ugly. The idea of youth made Gray turn obsessive and deranged to the point of taking his own life at the end. He had lost. He could not stay pure and beautiful like his portrait, which he destroyed. The Picture of Dorian Gray ended with a dead Dorian lying on the floor in a pool of blood with not an ounce of happiness left, but a vain, angry young man who grew old on and died due to his obsession with being