Sternberg's Triangular Theory of Love says romantic love is built from intimacy, passion, and commitment. In Social Psychology, it explains why relationships can feel intense, stable, close, or some mix of all three.
Sternberg's Triangular Theory of Love is a Social Psychology model that breaks love into three parts: intimacy, passion, and commitment. Instead of treating love as one feeling, the theory shows that different relationship experiences come from different combinations of those three components.
Intimacy is the emotional side of love. It means closeness, trust, and the feeling that you can be real with another person. If you have strong intimacy with someone, you probably feel understood, supported, and connected even when things are not exciting.
Passion is the spark. It includes physical attraction, romance, and the rush of desire that can make a relationship feel intense at the start. Passion can be strong early on, but it often changes faster than the other two parts, which is why some relationships feel hot and fast without lasting very long.
Commitment is the decision to stay with someone and the long-term choice to maintain the relationship. It gives structure and stability, especially when the relationship moves past the intense early phase. In Sternberg's model, commitment is often what keeps love going when passion fades a little or when real-life stress shows up.
The big idea is that the balance matters. A relationship with all three components is called consummate love, which is the full version of the model. But if only one or two pieces are present, you get different types of love, such as infatuation when passion is high but intimacy and commitment are low, or companionate love when intimacy and commitment are strong but passion is weaker.
Social Psychology uses this theory to explain how relationships develop over time, not just how they feel in one moment. That makes it useful for thinking about why two couples can both say they are in love but mean very different things.
This theory matters in Social Psychology because it gives you a way to describe relationship quality instead of relying on vague labels like "good chemistry" or "real love." When you break a relationship into intimacy, passion, and commitment, you can explain why some couples feel deeply bonded but not especially romantic, while others feel intense attraction but are not built to last.
It also connects directly to other relationship topics in the course, especially attraction, attachment, and relationship satisfaction. A couple might have strong passion early on, but if communication is weak or commitment is shaky, the relationship may not stay stable. On the other hand, a long-term pair may look calm from the outside but still score high on intimacy and commitment, which fits companionate love.
The model is useful because it helps you interpret change over time. Relationships are not fixed, and Sternberg's theory gives you language for describing that shift. A breakup, for example, may not mean the relationship had no love at all. It may mean one component faded faster than the others, or the balance never fully developed in the first place.
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view galleryIntimacy
Intimacy is one of the three parts of Sternberg's model, and it refers to emotional closeness, trust, and warmth. In a relationship, intimacy shows up when partners feel comfortable sharing private thoughts or relying on each other for support. Without intimacy, a relationship may have attraction or commitment, but it can feel distant or shallow.
Passion
Passion gives the theory its emotional heat. It covers physical attraction, romance, and desire, which often make a relationship feel exciting at the start. Sternberg treats passion as a separate piece because it can be strong even when partners do not know each other well. That is why passion alone can create infatuation, not necessarily lasting love.
Commitment
Commitment is the decision to stay in a relationship and the choice to keep investing in it over time. In Sternberg's framework, commitment is what adds stability and staying power. A couple may lose some passion but keep the relationship strong if commitment and intimacy remain high. That is why long-term love often looks different from early-stage romance.
Companionate love
Companionate love is one of the love types that comes out of the triangular theory. It usually means high intimacy and high commitment, but lower passion. You see it in close long-term relationships where partners feel deeply connected and loyal, even if the relationship is less intense than it once was. It is not "less real," just structured differently.
A quiz item or short-answer prompt might give you a relationship scenario and ask which component is strongest. Your job is to identify the mix of intimacy, passion, and commitment, then name the type of love that fits best. If a couple is deeply affectionate and has been together for years, you might connect that to companionate love. If a relationship is intense but new and unstable, infatuation is the better match.
In a case analysis, use the theory to explain change over time. Say which part is growing, which part is fading, and what that does to the relationship. If the prompt describes long-term stability after the “honeymoon phase,” commitment becomes the most useful piece to mention.
Passionate love is only one possible combination in Sternberg's model, usually marked by strong passion with little intimacy or commitment. Sternberg's Triangular Theory is the full framework that explains all the possible mixes of the three components, not just the hot, early-stage version.
Sternberg's Triangular Theory of Love says love is made of intimacy, passion, and commitment.
Different combinations of those three parts create different relationship types, including infatuation, companionate love, and consummate love.
Passion often rises fast and changes quickly, while intimacy and commitment tend to build more slowly.
The theory is useful because it explains why two relationships can both count as love but feel very different.
In Social Psychology, you use the model to analyze relationship scenarios, not just to define romance in general.
It is a theory that says love has three components: intimacy, passion, and commitment. Social Psych uses it to explain why relationships can differ in closeness, attraction, and stability. The mix of those parts creates different kinds of love.
The three components are intimacy, passion, and commitment. Intimacy is closeness and emotional connection, passion is attraction and desire, and commitment is the decision to stay with someone. The model looks at how those pieces combine in real relationships.
Companionate love is high in intimacy and commitment but lower in passion, so it feels close and stable. Passionate love is more about intense attraction and romance, usually with less of the long-term bond. That difference matters a lot when you compare short-term and long-term relationships.
Look at the scenario and sort the clues into intimacy, passion, and commitment. Then match the combination to the love type that fits best. If the prompt asks about relationship change, explain which component is growing or fading and how that changes the relationship.