Rich Boy's nose cut

A rich but spoilt boy fell in love with a girl and showered her with gifts though she didn't reciprocate his love. Once she was injured and he took her to the hospital, paid the bills and even gave some blood. But the girl fell in love with someone else and when the boy found this out he shouted at her and asked her to give back all the gifts that he had given. The girl agreed and gave him back the gifts. The boy by now was insanely angry and shouted: "Well, how about the other thing that I gave you. How are you going to give me back the blood?" The girl replied nonchalantly: "In monthly installments."