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Given the powerful implications of relationship quality for health and well-being, a central mission of relationship science is explaining why some romantic relationships thrive more than others. This large-scale project used machine learning (i.e., Random Forests) to 1) quantify the extent to which relationship quality is predictable and 2) identify which constructs reliably predict relationship quality. Across 43 dyadic longitudinal datasets from 29 laboratories, the top relationship-specific predictors of relationship quality were perceived-partner commitment, appreciation, sexual satisfaction, perceived-partner satisfaction, and conflict. The top individual-difference predictors were life satisfaction, negative affect, depression, attachment avoidance, and attachment anxiety. Overall, relationship-specific variables predicted up to 45% of variance at baseline, and up to 18% of variance at the end of each study. Individual differences also performed well (21% and 12%, respectively). Actor-reported variables (i.e., own relationship-specific and individual-difference variables) predicted two to four times more variance than partner-reported variables (i.e., the partner’s ratings on those variables). Importantly, individual differences and partner reports had no predictive effects beyond actor-reported relationship-specific variables alone. These findings imply that the sum of all individual differences and partner experiences exert their influence on relationship quality via a person’s own relationship-specific experiences, and effects due to moderation by individual differences and moderation by partner-reports may be quite small. Finally, relationship-quality change (i.e., increases or decreases in relationship quality over the course of a study) was largely unpredictable from any combination of self-report variables. This collective effort should guide future models of relationships. [ABSTRACT FROM AUTHOR]

A “rebound relationship” is commonly understood as a relationship that is initiated shortly after a romantic breakup—before the feelings about the former relationship have been resolved. However, little research has examined the consequences of quickly beginning new romantic relationships after another has ended. In two studies we examined people who experienced a breakup and assessed their well-being, their feelings about their ex-partner, and whether they were seeing someone new. Analyses indicated that people in new relationships were more confident in their desirability and had more resolution over their ex-partner. Among those in new relationships, the speed with which they began their relationship was associated with greater psychological and relational health. Overall, these findings suggest that rebound relationships may be more beneficial than typically believed. [ABSTRACT FROM PUBLISHER]