Final answer:
Romantic relationships are defined by passionate and companionate love, which play essential roles in shaping relationship dynamics.
Explanation:
In romantic relationships, the relationship with a romantic partner can be defined by passionate love and companionate love. Passionate love involves intense emotions and can be both exhilarating and painful, while companionate love is based on affection and interdependence. These two types of love play crucial roles in defining the dynamics of romantic partnerships.
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