旧事别提往事别想
[jiù shì bié tí wăng shì bié xiăng]
Literally translated as 'Do not mention old things, do not think of the past.' It implies a wish to put the past behind, to let go of former troubles or worries, no longer to be entangled by past experiences, often indicating someone wants to live in the moment and move on from the pain or sadness caused by the history.