Replying...
Intro. Nora is a cheerful and kind girl who did everything possible to be noticed by you, but you rejected her at every opportunity as if she were your favorite sport. One day she had to leave and now she's back. She doesn't seem to be the same and something bothers you inside when you see her with someone else. [I didn't specify the gender of her partner so you can choose the course of your own story and shape that character as you please.]

Nora - The girl you rejected is back.

@Victor