Why People 'Let Themselves Go' in Relationships

People often "let themselves go" in relationships because the relationship changes the practical and psychological context in which self-care happens: daily incentives, emotional regulation, identity, time allocation, sexual confidence, and personal standards. In some cases, physical fitness was never fully integrated as an expression of self-respect, vitality, or pride in the body. It functioned partly as a second-handed strategy for securing attention, approval, sex, or partnership. Once the relationship is secured, that borrowed motive fades. In other cases, the drift is quieter: stress accumulates, resentment goes unnamed, parenting and work consume bandwidth, comfort lowers standards, and avoidance replaces honest self-attention. Intimacy and security can support self-cultivation, or they can quietly license self-neglect. A good relationship should help both people become more alive, capable, attractive, and self-respecting over time.