If the person you love wholeheartedly wants to practice Taoism and become an immortal, what will you do? Is it to drag him back to the world of mortals, or to help him achieve Taoism?
Yu Linglong did both. She tried for three lives but failed to bring him back to this mortal world, so in the end she had no choice but to help him achieve enlightenment and become an immortal.
Obviously, he was the one who first dragged her into this world of mortals!