Close, intimate relationships are an essential part of human existence. And obviously, when a partner cheats, it isn't exactly going to brighten your day. New research by Nathan DeWall (psychology professor University of Kentucky) and colleagues explored the role of attachment style in cheating behavior and attitudes.
Basically, there are three types of attachment styles. The first is a secure attachment style, which is characterized by positive past relationship experiences and well, security. The second is the anxious attachment style, which is characterized by inconsistent past relationships. For this style, see the classic clingy partner. The third is avoidant attachment style, which is characterized by a sense of isolation and resistance to getting close to others. For this style, see the partner that never really opens up to the other person (or anyone!).
Their findings indicate that people with avoidant attachment styles are more accepting of other's cheating behavior and are more likely to cheat themselves. It also showed that these people spend longer times gazing at attractive people outside of the relationship, and view alternatives to their current relationship more favorably.