Romantic relationships are a central part of young adults' lives. That is why it is important to continuously examine how different aspects of a partner relationship contribute to its satisfaction. The aim of this study was to examine the role of attachment, expressions of affection and antagonism, and the partner responsiveness in explaining relationship satisfaction. The study involved 436 participants aged 18 to 40 who have been in a romantic relationship for at least 6 months. Participants completed questionnaire measures that examine attachment to a romantic partner, expression of affection and antagonism, perceived partner responsiveness, and satisfaction with the relationship. A hierarchical regression analysis was conducted, with control variables in the first step (gender, age, relationship duration) and variables of interest in the second step. Avoidant attachment, expression of antagonism, age and gender (men are more satisfied) had a significant individual negative contribution in predicting relationship satisfaction. Perceived partner responsiveness had a significant individual positive contribution. Anxious attachment and expression of affection did not have a significant individual contribution, but their role in relationship satisfaction should not be ignored. Partner responsiveness proved to be the strongest predictor of satisfaction, and its relationship with other predictors should be further examined.