In Chapter 7, I map out an integrated theory of relationship processes and health and illness trajectories. The cornerstone of the integrated theoretical approach is understanding close relationships and health and illness trajectories as co-created, co-generative, and systematic processes. Co-created theory engages what we currently understand with what we do not yet know and what continues to emerge through co-generative engagement. In close relationships and in health and illness, the subject matter is complex, and the theoretical lens engages the parts of the subjects we know with ongoing unfolding of what is manifest and what is understood over time. In describing emergence or generativity of interconnected systems, the end goal is not to take into account all of the contributing variables, but to recognize competing tensions and stakeholders and how interactions are communicatively coproduced at particular moments and over time.