连挽留都没有用连转身都不回头
[lián wăn liú dōu méi yŏu yòng lián zhuăn shēn dōu bù huí tóu]
Even pleading for someone not to leave is useless; one even leaves without turning back. This reflects a sense of desperation after a relationship or connection ends, indicating profound sorrow at the lack of care or regret shown by someone parting ways with you.