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Many firms strive to create relationships with customers, but not all customers are motivated to build close commercial relationships. This article introduces a theoretical framework that explains how relationship-specific attachment styles account for customers' distinct preferences for closeness and how both attachment styles and preferences for closeness influence loyalty. The authors test their predictions with survey data from 1199 insurance customers and three years of purchase records for 975 of these customers. They find that attachment styles predict customers' preferences for closeness better than established marketing variables do. Moreover, attachment styles and preferences for closeness influence loyalty intentions and behavior, controlling for established antecedents (e.g., relationship quality). Finally, exploring the underlying process, the authors show that preference for closeness partially mediates the …