do not pursue those who leave you
Proverb advising against clinging to people who have chosen to leave; often used to express a calm, detached attitude toward departures.
See also: 去る者は追わず、来たる者は拒まず
When he said he would quit, I didn't try to stop him, following the idea of 'do not pursue those who leave.'
A Japanese proverb derived from the longer saying 去る者は追わず、来たる者は拒まず, which reflects a traditional attitude of accepting departures and welcoming new arrivals.