"It's no use crying over spilt milk"

Meaning: If something has already happened, there is nothing you can do to change it. Just accept it and move on.

Example: You already lost the game. It's no use crying over spilt milk. Just try harder next game so you might win.

A common English proverb that we say is:

"Actions speak louder than words"

This means that what you do is more important than what you say.

An idiom that we use that is similar is: "talk is cheap"

You can say whatever you want, but what really is important is what you do.