Colin believed that the world contained exactly two kinds of people: Dumpers and Dumpees. A lot of people will claim to be both, but those people miss the point entirely: You are predisposed to either one fate or the other. Dumpers may not always be the heartbreakers, and the Dumpees may not always be the heartbroken. But everyone has a tendency.

Colin Singleton, pp. 15-16 - An Abundance of Katherines (2006)