In this multisite study, we used a randomized controlled trial to examine how a relationship education intervention affected emerging adults' maladaptive relationship beliefs, mutuality, relationship decision making, relationship quality, and psychological distress. In addition, we explored whether one intervention modality (i.e., facilitated group discussion) was more/less effective than another (i.e., self‐facilitated online) and whether there were differential effects for participants in a relationship. We found that the facilitated group evidenced a decline in maladaptive relationship beliefs and an improvement in deliberate decision making. Moreover, facilitated group participants in a relationship reported higher levels of mutuality. Contrary to our hypothesis, there were no changes in relationship quality or psychological distress. Implications for the content and delivery of relationship education for emerging adults are discussed.