don't cry over spilt milk

There's no reason to complain about something that can't be fixed.

Don't cry over spilt milk. The past is past, and you can't do anything to change it.

Mona was unable to accept the reality of her divorce. She was crying over spilt milk.

It's no use crying over spilt milk- it was a bad investment, the money has been lost and there's nothing we can do.