This study examined the role of congruity in couples' social support behaviors on relational outcomes. Participants (N=123 couples, Mage=26.91, SD=8.46) completed surveys on relationship satisfaction and discord. Positive and negative behaviors were then observed during supportive interactions. Results revealed that the detrimental effect of negative behaviors on satisfaction was buffered by a partner's engagement in fewer negative behaviors or intensified by more negative behaviors. Further, the beneficial effect of positive behaviors on reducing discord was amplified by a partner's engagement in more positive behaviors or offset by fewer positive behaviors. Lastly, the detrimental effect of negative behaviors on discord was buffered by a partner's engagement in more positive behaviors. These findings highlight the complex nature of dyadic relationships and provide insights for developing interventions focused on improving romantic relationship quality.