Least said, soonest mended.

Least said, soonest mended.

proverb An unfortunate or painful event, situation, or memory will be forgotten (and thus mended in one's mind) more easily if it is not discussed. Primarily heard in UK, Australia. A: "I can't believe I lost so much money on that investment." B: "Ah well, least said, soonest mended."
See also: least, soon
Farlex Dictionary of Idioms.

least said, soonest mended

BRITISH, OLD-FASHIONED
If someone says least said, soonest mended, they mean that it is best not to say too much about something bad that has happened. I didn't mention the matter again. Least said, soonest mended is what I always say.
See also: least, mende, soon
Collins COBUILD Idioms Dictionary, 3rd ed.

least said, soonest mended

a difficult situation will be resolved more quickly if there is no more discussion of it.
See also: least, mende, soon
Farlex Partner Idioms Dictionary

ˌleast ˈsaid ˌsoonest ˈmended

(British English, saying) a bad situation will pass or be forgotten most quickly if nothing more is said about it: She’s still very angry, of course, but if you ask me it’s a case of least said soonest mended.
See also: least, mende, said, soon
Farlex Partner Idioms Dictionary
See also:
  • teach a man to fish
  • it takes a village
  • village
  • burnt
  • a burnt child dreads the fire
  • a reed before the wind lives on(, while mighty oaks do fall)
  • best-laid plans go astray, the
  • the best-laid plans
  • the best-laid plans go astray
  • the best-laid plans of mice and men
References in classic literature
"Aye, aye; least said, soonest mended. We'n no need to say why the match is broke off, an' we may hear of her after a bit.
Adam Bede
Nigel Soppitt, for Cane, said: "It's really the sort of case where least said, soonest mended."
Terrified victim left cowering and crying after being threatened in own home; Callum Stonehouse, 26, and Jordan Cane, 24, walked uninvited into the front room, one swinging a golf club before making the threats
A CASE of the least said, soonest mended. Maybe it's best to take a break from friends for a while and have some time for yourself.
stars
"Theresa asked, 'Doesn't anyone want to talk to me?'." Least said, soonest mended.
The Heckler
He said: "I think it's a case of least said, soonest mended.
PARTNER ROBBED; Dad snatched cash after row over finances
A royal insider says: "Least said, soonest mended."
WICKED
It comes to this - least said, soonest mended. He stands before you a chastened man."
Police 'no' to intimate pic query
But as neither apparently sexually assaulted you and you did go with them expecting sex, I think least said, soonest mended.
TWO girls I know
As my granny used to say: "Least said, soonest mended."
and another thing...