Why are men be so jealous?

Men, like anyone else, can experience jealousy due to various factors such as insecurity, fear of loss, or comparison to others. Societal expectations and gender norms may also play a role, as men are often conditioned to view relationships competitively. Jealousy can stem from a desire for validation and a need to protect their self-esteem and status. Ultimately, it's a complex emotion influenced by individual experiences and the dynamics of specific relationships.