不怪人潮拥挤怪我留不住你
[bù guài rén cháo yōng jĭ guài wŏ liú bù zhù nĭ]
Translated as 'Not Blaming the Crowds, But My Inability to Keep You', it indicates a sentiment where one doesn't blame external factors for losing someone but takes responsibility personally, showing remorse and self-reflection.