Envy can arise in various relationships, whether romantic or platonic, often triggered by comparisons of achievements, resources, or attention. Emily highlights how a partner's success or interests outside the relationship can spark feelings of inadequacy, while Dedeker points out how perceived disparities in resources like money or time can intensify these emotions. Jace emphasizes that in non-monogamous contexts, feelings of envy often surface when one partner appears to have more dating success, especially during the early stages of opening up a relationship.