如果他总为别人撑伞你何苦为他等在雨中
[rú guŏ tā zŏng wéi bié rén chēng săn nĭ hé kŭ wéi tā dĕng zài yŭ zhōng]
If he always holds an umbrella for others, why should you wait in the rain for him? This sentence conveys disappointment in unreturned affection, questioning staying faithful to someone who doesn't reciprocate care and devotion.