By drawing on Jean-Luc Nancys philosophy of ontological relationality, this article explores what it means to be a we in breast cancer. What are the characteristicsthe extent and diversityof couples relationally lived experiences of bodily changes in breast cancer? Through analyzing duo interviews with diagnosed women and their partners, four ways of sharing an embodied life are identified. (1) While being different together, partners have different, albeit connected kinds of experiences of breast cancer. (2) While being there for you, partners take care of each other in mutually dependent ways. (3) While being reconnected to you, partners (re-)relate to each other through intimacy and sexuality. (4) While being like you, partners synchronize their embodied daily lives to one another, sometimes up to the point that the self cannot be distinguished from the other anymore. These ways reveal that being a we involves complex affective, bodily encounters in which the many fault lines that both separate partners into individual selves and join them together as a unity are continuously reshaped and negotiated. Being a we may be understood as something we have to do. Therefore, in being true to the legacy of Nancy, we argue at the end of this article for a sensible praxis of sharing a life and body, particularly in breast cancer.