Correct

单相思

/ dānxiāngsī /
Strokes

Definition

one-sided lovesickness/unrequited longing

Example

As a Verb

develop an unrequited/unreturned love

1
Zhǐ
只怕
duì
zhǐshì
只是
dānxiāng
单相思
  

I'm afraid your love for her is an unrequited one.