Susan grew up in a family in which preparations for every major event were preceded by a major argument after which each family member "proved his or her love" by attending the event in spite of bad feelings. Susan repeats this pattern with her boyfriend Tom. This is an example of how individuals:

Unknowingly play relationship games.  

Explanation:

Susan's family members play a major argument whenever they prepare for the major events. Her family has major argued at the preparation of events preceded in the family.

After events, they all show and try to prove their love and care for the family. It occurs even when someone in the family is not feeling good. They have a bad feeling even they have to show this type of care and love. So when Susan repeats this pattern the same with her boyfriend. This is an example Unknowingly play relationship games.