“Some bells cannot be unrung.”
So goes the saying when something has been done that cannot be undone. The ink has been spilled, the glass has been shattered, the clock cannot be rewound, the world has moved on. The arrow has flown, the words said cannot be recalled to the mouth, and “send” has been pressed. There is no going back, no fixing things “as they were”, or maybe “as they should have been”.
From now on, for good or for ill, things can never be the same.