爱了不该爱的人伤了不该伤的心
[ài le bù gāi ài de rén shāng le bù gāi shāng de xīn]
It indicates having fallen in love with a wrong match that leads to hurt. Both the lover chosen and resulting emotional damage could be ones better left avoided. There is a clear remorse felt about choosing someone unsuitable, leading to unintended negative consequences