原谅我不懂挽留你却走远
[yuán liàng wŏ bù dŏng wăn liú nĭ què zŏu yuăn]
'Yuan liang wo bu dong wan liu ni que zou yuan' might mean something like 'Forgive me for not understanding how to hold on to you as you walk away'. This shows guilt, remorse and regret for a past relationship or incident.