In "Think Like a Man," Steve Harvey addresses the issue of dealing with jealousy and insecurity in relationships by emphasizing the importance of communication, trust, and understanding between partners. He encourages open and honest conversations to address any feelings of jealousy or insecurity, and suggests building a strong foundation of trust to overcome these challenges in relationships. Harvey also emphasizes the significance of self-confidence and self-worth in dealing with jealousy and insecurity, highlighting the importance of valuing oneself and one's partner in a healthy relationship.