It's no use crying over spilt milk

कृतस्य करणं नास्ति
मृतस्य मरणं तथा ।
गतस्य शोचना नास्ति
ह्येतद् वेदविदां मतम् ॥

What has been done cannot be done again.
What has been dead cannot die again.
What has been lost should not be repented for.
This is the opinion of Vedic Scholars.

Let bygones be bygones.
What's done cannot be undone.
Eggs cannot be unscrambled.