American psychologist Robert Sternberg originally theorized love is composed of three elements: passion, intimacy and commitment. But these elements do not comprehensively describe the complexity of romantic relationships.
Researchers have long sought to include other elements such as partner compatibility, emotional connection, accessibility, responsiveness, engagement, acceptance, the ability to communicate and reveal thoughts and feelings (called “self-disclosure”), independence and conflict resolution.
What’s more, although it’s well established physical attraction and earning potential will influence how people select partners, similarity and familiarity are more important for relationships long-term.
Over time, similarities such as values, political attitudes, and religiosity become more relevant and are likely to lead to greater happiness and relationship satisfaction.
All of these are qualities you’d also find in a good friend.