In the book "Attached: The New Science of Adult Attachment and How it can Help You Find and Keep Love", Amir Levine and Rachel Heller describe the three main attachment styles. When many people think of dependency, they think of a bad attachment that nurtures only negative feelings and a terrible outcome. Looking for love and using science to keep it can be very easy if you understand the anxious, avoidant, and secure attachment styles. Using some psychological analysis, these two authors found that many relationships in which an avoidant style dates an attached style usually ends badly since both are trying to change their attachment styles. Some tricks in this book will teach you how to cope with your significant other who may be a different attachment style than you. I highly recommend reading this book before starting a new relationship.