Rusbult’s Investment Model [32–33], based on Interdependence Theory, proposes that motivation to maintain a relationship is the product of four variables: (1) investment size, or the direct and indirect resources (e.g., time invested, cognitive interdependence, plans for the future) that represent the ways one is bound to the relationship; (2) satisfaction, or how rewarding the relationship is; (3) quality of alternatives, or the degree to which one believes that one’s needs could be fulfilled in another relationship; and (4) commitment, or the subjective representation of dependency, experienced as a feeling of psychological attachment to the partner and desire to maintain the relationship [31]. Relationship commitment typically arises when one is highly invested and satisfied, and perceives that there are no better options to one’s current relationship. Commitment, in turn, promotes relationship persistence.