This document discusses factors that lead to friendship and attraction. It addresses proximity and exposure leading to liking, the role of physical attractiveness, similarity versus complementarity, liking those who like us, and relationship rewards. It then defines different types of love, including passionate love and companionate love. Attachment styles, equity, and self-disclosure are presented as enabling close relationships. The document concludes by briefly discussing how relationships can end, such as through divorce, and the detachment process of ending relationships.