"How sad it is! I shall grow old, and horrible, and dreadful. But this picture will remain always young. It will never be older than this particular day of June... If it were only the other way! If it were I who was to be always young, and the picture that was to grow old! For that-for that-I would give everything! Yes, there is nothing in the whole world I would not give! I would give my soul for that!"
Oscar Wilde, The Picture of Dorian Gray Ch. 2

What is the price of Dorian Gray's Faustian Bargain?

Dorian would sacrifice anything in exchange for limitless youth and because of that, the poor boy had to deal with the consequences. First of all, his life went from bad to worst. As the novel advanced, we saw how he got corrupted deeper and deeper. Killing a girl and feeling no regrets, stabbing one of his best friends in the back, getting outcasted by the village people because they thought he worshiped satan, etc... He lived a miserable and guilty life, until the day he stabbed the portrait, who had his soul, and because of that, he died, recovering his real age body, while his portrait got new as day one.

Dorian’s wish to achieve perpetual beauty brought him to desire to lose everything he had if that meant he would remain superficially perfect forever. Yet he did not know that the soul was the representation of his inner beauty, which he was taken away once his wish was granted. Without it, his identity deteriorated while his appearance endured changeless throughout the time he carried out dreadful acts; hence destroying the mirror-like connection between his soul and body. He became shady, unethical and nefarious, corrupting the ones surrounding in an even darker way that Lord Henry Wotton did to him.