English Idiom...
“Cry over spilt milk” also “Cry over spilled

milk”
Meaning
>to be upset about things that have already been done
>to cry about past events that cannot be undone
>to dwell pointlessly about a mistake that can no longer be changed
>to be upset about past misfortunes
>to feel sorry about something that has already happened

Example Sentences
1.) While its sad that the results have not been as good as you expected, you should now focus on moving ahead and achieving better results next time; there is no use crying over spilt milk.
2.) Valarie's car was badly damaged in the accident and she was very angry about what had happened, but she soon realized that there was no use crying over spilt milk.
3.) “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 now."
4.) Mona was unable to accept the reality of her divorce. She was crying over spilled milk.
5.) The school trip had been a disaster, but we did not want to dwell on it. It was no use crying over spilt milk.