Many people get into the habit of falling for people who are already married or in a relationship. When asked why they repeatedly pursue people who are unavailable, they say the thrill of chasing after the forbidden -- angling for what they know they can't have -- is too irresistible to suppress. But becoming a homewrecker can have dire consequences. For starters, you're coming between a person and his or her partner, who may even have children together. Studies show that infidelity can cause irreparable damage to a marriage or relationship, with the fallout spilling into home life and even one's career. If a person has that much of a penchant for chasing after the unobtainable, it raises serious questions about the individual: Why not pursue people who are available? Has a lack of self-esteem or other psychological issue convinced the person that he or she isn't deserving of single suitors? Is the person a commitmentphobe? Does he or she simply want to h...