How can social exchange theory be used to explain interpersonal relationships?

Could you please elaborate on how social exchange theory can be applied to better understand and explain the dynamics of interpersonal relationships? I'm particularly interested in understanding how the concept of cost-benefit analysis, as a central principle in social exchange theory, might shed light on the ways in which individuals weigh the potential gains and losses of various social interactions and ultimately make decisions about who to engage with and how. Additionally, how does social exchange theory account for the emotional and non-material aspects of interpersonal relationships, and how do these factors influence the overall balance of costs and benefits?