Intimate relationships, both romantic relationships and friendships, are of special importance for identity development in emerging adulthood. In the current study, we investigated longitudinal associations between Big Five personality traits and relationship quality (romantic relationships and friendships) and whether these associations are mediated by identity. A sample of emerging adults (N = 372, 55% women) completed self-report questionnaires on personality and identity in 2015 (Mage = 21.90 years, SD = 1.16) and on quality of friendships and romantic relationships 3 years later. By using MPlus, we tested the multivariate mediating effect of identity dimensions in the relationship among Big Five personality and quality of relationships. No mediation of identity dimensions was found. Extraversion predicted higher friendship quality 3 years later and exploration in depth was positively associated with friendship quality. Regarding romantic relationship quality, no significant direct or indirect effects were found. However, personality predicted multiple identity dimensions.
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