the die is cast
(idiomatic) Conclusive action has been taken, so events will proceed in an irreversible manner; the point of no return has been passed; the future is determined; there are no more options.
Synonyms: genie is out of the bottle, les jeux sont faits, you can't put the toothpaste back in the tube, you can't unring a bell
By the time a person has achieved years adequate for choosing a direction, the die is cast and the moment has long since passed which determined the future. Zelda Fitzgerald
Caesar exclaimed: "Let us accept this as a sign from the Gods, and follow where they beckon, in vengeance on our double-dealing enemies. The die is cast." Suetonius
God willing, the die is cast. Source: Internet
They may not be accurate, but they tend not to change once the die is cast; when something is printed on the film of our minds, it’s often projected through us for the rest of our lives.” Source: Internet