Sternberg's Triangular Theory of Love
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In the triangular theory of love, love is characterized by three elements: intimacy, passion and commitment. Each of these elements can be present in a relationship, producing the following combinations:

* Liking or friendship (intimacy)
* Infatuation or limerence (passion)
* Empty love (commitment)
* Romantic love (intimacy+passion)
* Companionate love (intimacy+commitment)
* Fatuous love (passion+commitment)
* Consummate love (intimacy+passion+commitment)