Mutual happiness in a human relationship means a state in which both individuals experience continuous happiness through right understanding, trust, respect, affection, care, guidance, reverence, glory, gratitude, and love. It is based on harmony between individuals, where each person is concerned about the happiness and prosperity of the other. In Universal Human Values, mutual happiness is not dependent on physical facilities or temporary pleasures but is rooted in right feelings and right conduct. It is achieved when relationships are based on understanding rather than expectations, domination, or selfish interests. Human beings naturally aspire for happiness and prosperity. While prosperity relates to physical needs, happiness is primarily a matter of relationships and inner satisfaction. A person cannot remain truly happy in isolation because human life is interconnected. Family, society, and the larger human community all contribute to an individual's well-being. Therefore, mutual happiness becomes an essential goal of every human relationship. Trust is the foundation of mutual happiness. Trust means the assurance that the other person intends to ensure my happiness and prosperity. When trust exists, fear, doubt, and insecurity disappear. It creates confidence and stability in relationships. Without trust, relationships become weak and filled with misunderstandings. Respect is