She didn't share his feelings towards her. That's unrequited love.

她对他没有像他对她一样的感情，这就是单恋了。

youdao

White was a boy ten years Unrequited love, love, her dedication to her students is difficult to identify the feelings of falling in love because of loneliness.

小白曾苦恋一个男孩十年，她对爱情的执着使她很难认同留学生中因寂寞而相恋的感情。

youdao

Basically, all of her songs are revolving around the theme of unrequited love and so are my movies.

阿黛尔所有歌曲基本上都以单恋为主题，而我拍的影片也是如此。

youdao

As Barnabas schemes to turn the Collins family from old money to nouveau riche, Angelique appears, demanding that he requite her unrequited love.

FORBES: 'Dark Shadows' Is More Light Than Dark

Paralyzed by this prediction, and struggling to come to terms with his unrequited love for his mentor's younger wife, Clara Schumann (a formidable musician in her own right), Brahms embarks on a decades-long struggle to compose his first symphony.

NPR: Marin Alsop: Orbiting the Symphonies of Brahms