Despite the importance of apologies in repairing interpersonal conflict and restoring relational harmony, limited empirical research has examined whether apology proclivity and perceived apology sincerity predict romantic relationship satisfaction among Filipino young adults. This study investigated the predictive roles of apology proclivity and perceived apology sincerity in predicting romantic relationship satisfaction among 418 Filipino young adults aged 21–35 years who were in committed romantic relationships. A quantitative, correlational-predictive research design was employed using the Proclivity to Apologize Measure (PAM), the Perceived Apologizer Sincerity measure, and the Couples Satisfaction Index (CSI-16). Data were analyzed using descriptive statistics, Spearman’s rho, and multiple linear regression with heteroskedasticity-consistent (HC3) robust standard errors. The respondents obtained a mean score of 65.70 (SD = 12.90) in relationship satisfaction, a mean score of 5.89 (SD = 1.08) in apology proclivity, and a mean score of 74 (SD = 11.60) in perceived apology sincerity. Relationship satisfaction was positively correlated with apology proclivity (ρ = .47, p < .001) and perceived apology sincerity (ρ = .62, p < .001), while apology proclivity was also positively correlated with perceived apology sincerity (ρ = .44, p < .001). A multiple linear regression analysis revealed that apology proclivity (β = .12, p = .031) and perceived apology sincerity (β = .70, p < .001) significantly predicted relationship satisfaction, with the model explaining 57.0% of the variance (R² = .570). Perceived apology sincerity emerged as the stronger predictor of relationship satisfaction.
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