information:classification, structural:reformatting
Evaluating the relationship

Individuals in intimate relationships evaluate the relative personal benefits and costs of being in the relationship, and this contributes to the decision to stay or leave. The investment model of commitment is a theoretical framework that suggests that an evaluation of relationship satisfaction, relationship investment, and the quality of alternatives to the relationship impact whether an individual remains in a relationship.

Because relationships are rewarding and evolutionarily necessary, and rejection is a stressful process, people are generally biased toward making decisions that uphold and further facilitate intimate relationships. These biases can lead to distortions in the evaluation of a relationship. For instance, people in committed relationships tend to dismiss and derogate attractive alternative partners, thereby validating the decision to remain with their more attractive partner.