Plot point #1: Will Christian be able to meet Setine and show her his talent? Yes, he is definitely able to. However, Christian's play write friends disguise him as a Duke to pass him off (Christian has no idea) in order to make sure he has privacy with Setine. Of course Setine thinks he is a Duke and so she thinks she must "entertain" him. Christian is overwhelmed by Setine's perversion, and has no choice but to sing to her in order for her to stop. Seting stops and is mesmerized by Christian. She openly says in a daze, "I can't believe it, I'm in love with a Duke." They fall in love. She later finds the real Duke comes in. She hides Christian successfully, and once the Duke is gone Christian asks Setine if she was being serious about her saying she was in love. Setine plays hard to get and allows herself to be taken by love with Christian.
Plot Point #2: Setine has gotten abnormally sick over the time and her spending time with Christian is becoming more and more dangerous. The Duke wants to have Setine for himself. Setine and Christian get so fed up with everything and decide to run away. The owner to the Moulin Rouge, who is like a father to Setine, finds out what they plan to do. From the pain he knows they will end up going through, and warns her that the Duke will kill Christian. When that didn't stop her he tells Setine she is in fact dying. She has tuberculosis. Setine feels as if now she will never be able to get away from her trap. The owner tells Setine the only way she can save Christian is to drive him away and say she was always only acting, and she was only trying to keep him in oder to really make good use of his talent for the Moulin Rouge. With an aching heart, Setine does so, and causes Christian to feel as if he was only used as she always had to use men.
Plot Point#3: Christian takes a big risk and realizes he had to make a scene take back his pride before ever leaving Paris. He looks for Setine and pays her off for the time they had in front of an audience. Setine, heartbroken, could not bare it. She is reminded by an old friend, "The greatest thing you'll ever learn, is just to love and be loved in return." Setine takes her chances for love. The Duke tried in all his power to stop and kill Christian but fails. In the most amazing moments in Christians love life, Setine suffers a fatal stroke and literally dies at that moment.