This article tests three competing theories that attempt to explain the reasons for and shape and direction of the relationship between self-disclosure and relationship quality among nonmarital cohabiting couples. The data strongly support the linear model which suggests that the greater the degree of self-disclosure, the greater the degree of relationship quality the couple will achieve. The article concludes that relationship depth emerges only after the couple are able to deal openly and creatively with conflict. One of the key prerequisites for achieving the ability to creatively handle conflict seems to be that the couple must have a high level of commitment to working on the relationship and possess the necessary communication and problem-solving skills that permit the couple to change and grow.