one-sided love; unrequited love

• 单相思

one-sided love; unrequited love的用法和样例：

例句

1. You are Hilter's unrequited love!
   你是希特勒单相思的情人。
2. He falls in love very easily and often it's unrequited love.
   他总是很快爱上某人，而且往往是单相思。