it's no good/use crying over spilt milk

It's no use crying over spilled milk.

 and Don't cry over spilled milk.
Prov. Do not be upset about making a mistake, since you cannot change that now. I know you don't like your new haircut, but you can't change it now. It's no use crying over spilled milk. OK, so you broke the drill I lent you. Don't cry over spilled milk.
See also: crying, milk, over, spill, use

it's no use crying over spilled milk

or

there's no use crying over spilled milk

If you say it's no use crying over spilled milk or there's no use crying over spilled milk, you mean that people should not worry or be upset about things that have happened and cannot be changed. Note: `Spilled' can also be spelled `spilt' in British English. It didn't work out, but there you go. It's no use crying over spilt milk. Note: This expression is very variable, for example no use can be replaced by no good or no point. Often, the expression is said without it's or there's. Oh well, it's done now. No point crying over spilt milk.
See also: crying, milk, over, spill, use

it’s no good/use crying over spilt ˈmilk

(saying) it is a waste of time worrying, complaining or feeling sad about something which is done and cannot be changed: His decision to resign was disappointing, but it’s no use crying over spilt milk. We need to concentrate on finding someone to replace him.
See also: crying, good, milk, over, spilt, use