From Dr. Willard Harley http://www.lifetimefitness.com/magazine/index.cfm?strWebAction=article_detail&intArticleId=257

Freeloader and Buyer

Freeloaders and Buyers rarely get together in new relationships, but when they do, the Buyer is likely to get seriously burned. The Buyer is exclusively and permanently committed, and the Freeloader is not. He or she may be cheating on the Buyer, or may even be openly pursuing other relationships. (Think of rock stars and their groupies.)

Most often, Freeloader-Buyer combinations are actually remnants of relationships that once connected two Buyers. If a Buyer becomes a Freeloader, it�s usually because he or she had an affair.

The relationship between a Buyer and Freeloader is a disaster for the Buyer. While infidelity is the most obvious problem, simple neglect can also make the relationship impossible for the Buyer: A Freeloader tends to live his or her life as if the Buyer didn�t even exist.

A Buyer can set an example for a Freeloader of how romantic partners should treat each other. But in the end, if a Freeloader is not converted, the Buyer should terminate the relationship to avoid a painful life of neglect and codependence.