According to Moreland and Levine's theory,commitment to the group is highest among prospective members and begins to decline once acceptance occurs.

Moreland And Levine's Theory

A model detailing the processes through which individuals join groups, become integrated into them, and eventually leave them, highlighting the stages of exploration, assimilation, and exit.

Commitment

The state or quality of being dedicated to a cause, activity, or organization, often reflected in a willingness to give time and energy to it.