Sense of purpose, or feeling that one has personally meaningful goals and directions guiding them through life, consistently predicts a variety of desirable well-being, health, and social outcomes. However, work has been limited with respect to evaluating it as a predictor and promoter of romantic relationships or how purpose may develop in these contexts. For instance, healthy romantic relationships could also help individuals develop and maintain a higher sense of purpose. With cross-sectional evidence finding positive associations between sense of purpose and romantic relationship commitment and satisfaction, the current study expanded on past work by using longitudinal data with three months between two measurement occasions (Time 1: N = 2243; Time 2: N = 1284) to evaluate whether sense of purpose predicted relationship status over time and how changes in relationship quality and sense of purpose were associated. Results showed that a greater sense of purpose predicted maintaining a romantic relationship but did not predict later romantic relationship quality, although higher romantic relationship quality predicted an increase in sense of purpose. Findings are discussed regarding why people with a higher sense of purpose may be more likely to stay in relationships as well as the role that positive romantic relationships may play in helping maintain a higher sense of purpose.