别等不该等的人别伤不该伤的心
[bié dĕng bù gāi dĕng de rén bié shāng bù gāi shāng de xīn]
'Don't wait for the person who shouldn't be waited; don't hurt the heart that should not be hurt', this expresses the lesson-learned after experiencing unreciprocated love which left a person being emotionally drained