The document summarizes several theories about the formation, maintenance, and breakdown of romantic relationships: 1. Clore and Byrne's reinforcement affect model suggests that people form relationships with those who reward them positively, and they develop affections for those associated with rewarding experiences. 2. Argyle's reward/need satisfaction theory proposes that people form relationships to fulfill basic needs like biological needs, dependency, affiliation, and self-esteem. 3. Social exchange theory views relationships as an exchange of rewards between partners, and people aim to maximize rewards and minimize costs to receive satisfaction from the relationship.