Step 1: The question asks to describe the character of the girlfriend in the story "Love Defiled."
Step 2: The story shows the girlfriend pretending to be in love with the narrator while also being involved with another person. She manipulates the narrator's emotions for her own convenience.
Step 3: Her behavior—deceiving the narrator, creating false hopes, and skillfully managing her multiple relationships without getting caught—is a clear demonstration of being 'cunning'. She is clever in a deceitful and manipulative way.