你先走吧我跟不上你了
[nĭ xiān zŏu ba wŏ gēn bù shàng nĭ le]
Meaning 'You go ahead, I can't catch up with you.' It could suggest resignation to parting ways due to inability to keep up either physically or metaphorically, pointing out difference, incapability or unwillingness, leaving space intentionally between people.