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."

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.