Envy is a social experience, and it invariably occurs in dyads of the envious and the envied persons. Given the importance of envy as a social phenomenon, the current research seeks to investigate how envy affects interpersonal interactions in joint decision-making situations of negotiations. We propose that due to the painful feelings of being envious, envy will decrease the interpersonal trust between the envious and envied actor and ultimately harm their joint decision making. Moreover, we explored how if-then plans (i.e., implementation intentions) can help the envious actors to increase their trust in the envy situation, and thereby mitigate the negative effects of envy in negotiations. In general, the current research project focuses on the significant role of envy in the interactive processes of negotiations. Integrating the literature on negotiation and envy, we aim to highlight whether, how, and why envy impacts negotiators’ perceptions, behaviors, and achieved outcomes. By investigating potential interventions to overcome the negative effects of envy, we establish and validate effective tools to break through the envy barrier and help joint decision-makers achieve optimal solutions.