The present work advances and tests an interdependence-based model of the a
ssociations among commitment, pro-relationship behavior, and trust. Finding
s from two longitudinal studies revealed good support for model predictions
. Commitment-inspired acts such as accommodation and willingness to sacrifi
ce provide diagnostic information regarding a partner's pro-relationship mo
tives. Individuals come to trust their partners when they perceive that the
ir partners have enacted pro-relationship behaviors, departing from their d
irect self-interest for the good of the relationship. The results of mediat
ion analyses are consistent with a model of mutual cyclical growth in which
(a) dependence promotes strong commitment, (b) commitment promotes pro-rel
ationship acts, (c) pro-relationship acts are perceived by the partner, (d)
the perception of pro-relationship acts enhances the partner's trust, and
(e) trust increases the partner's willingness to become dependent on the re
lationship. Auxiliary analyses revealed that self-reported attachment style
does not account for substantial variance beyond the features of interdepe
ndence that form the basis for the present model.