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The triangular theory of love is a theory of love developed by Robert Sternberg. In the context of interpersonal relationships, "the three components of love, according to the triangular theory, are an intimacy component, a passion component, and a decision/commitment component."
Sternberg says that intimacy refers to "feelings of closeness, connectedness, and bondedness in loving relationships," passion refers to "the drives that lead to romance, physical attraction, sexual consummation, and related phenomena in loving relationships" and decision/commitment means different things in the short and long term. In the short-term, it refers to "the decision that one loves a certain other", and in the long-term, it refers to "one's commitment to maintain that love."