
don't cry over spilled milk
/ˌdoʊnt ˌkraɪ ˌoʊvər ˌspɪld ˈmɪlk/
don't waste time worrying about things that can't be changed
“The mistake is done—don't cry over spilled milk.”
Origin: English proverb documented since 1600s, referring to futility of lamenting irreversible accidents