心再痛也会有旧伤
[xīn zài tòng yĕ huì yŏu jiù shāng]
Translated, it would be something like 'Heartache Will Always Leave A Scar'. Meaning no matter how severe the emotional hurt or anguish is right now, it'll result in lingering scars - implying previous painful experiences that leave lasting imprints on your psyche or soul, whether physical or metaphysical, these old scars remain etched.