Covert contracts, defined as uncommunicated expectations within a relationship, often lead to significant resentment. This phenomenon occurs when one partner assumes the other will act a certain way without explicit discussion, leading to feelings of betrayal when those unspoken agreements are not met. Experts highlight the importance of direct communication to prevent these hidden deals from eroding trust and fostering dissatisfaction, distinguishing them from the general mental load but emphasizing their distinct contribution to relational strain.