RESUMEN

Intercultural romantic relationships are increasingly common and although the obstacles such couples face are well documented, the factors that facilitate their success are less studied. Although cultural differences may present challenges, they also offer opportunities for self-expansion-personal growth via new perspectives, knowledge, and identities. In three studies using cross-sectional, dyadic, longitudinal, and experimental methods (NTotal = 896), self-expansion was associated with relationship quality and identity outcomes (i.e., identity integration, cultural self-awareness). Self-expanding through a partner's culture (i.e., cultural self-expansion) was uniquely related to identity outcomes, beyond self-expanding more generally (relational self-expansion). Furthermore, actively sharing cultures and discussing their differences were linked to greater cultural and relational self-expansion, which in turn differentially predicted partners' relationship quality and cultural identities. These studies provide a first look at the role of self-expansion in intercultural relationships, demonstrating that the way couples negotiate their cultures is linked to both relational and personal outcomes.