This study examines the role of attitude towards jealousy, investment and commitment in feeling jealousy and different ways of expressing it. Contribution of commitment and investment in predicting feeling and expression of jealousy is considered, as well as the relationship between the attitude toward jealousy and the expression of jealousy. Additionally, it is investigated whether attitude toward jealousy moderates the relationship between feeling and expression of jealousy. 656 participants completed the Investment, Commitment, Interpersonal Jealousy and the Communicative Responses to Jealousy scales, as well as the newly formed Scale of Attitude towards Romantic Jealousy. All participants were in a relationship at the time of completing the online questionnaire and ranged in age from 18 to 35 years. Investment, but not commitment, contributes to predicting feelings of jealousy: more investment in a relationship predicts more jealous feelings. High commitment predicts more constructive, less destructive, and less avoidant communication, while investment has no independent role in predicting jealousy. The attitude toward jealousy is positively associated with almost all types of responses to jealousy. The attitude towards jealousy seems to have a moderating role only in connection between feeling jealousy and avoidant communication, with size of the effect being modest. The current study is a contribution to understanding feeling and expression of jealousy which is, due to its association with negative outcomes, an important topic in the research of romantic relationships.