cry over spilt milk

/kɹˈaɪ ˌəʊvə spˈɪlt mˈɪlk/

/kɹˈaɪ ˌoʊvɚ spˈɪlt mˈɪlk/

to cry over spilt milk

to be unhappy about a past event that cannot be undone

Examples

1. You screwed up and crying over spilt milk is not gonna change that.

2. I know I shouldn't have cried over spilt milk, but I was so upset when I lost my favorite necklace.

3. I'm really sorry I forgot your birthday, but there's no point in crying over spilt milk.

4. After accidentally dropping and breaking a valuable vase, someone might say, "I know it's gone, but I can't help crying over spilt milk."