谁都会有一段不懂事的过去，谁都会有一段不堪的回忆，有些事不会忘，由于不舍得，

有些事必须忘，因为不值得。

Everyone who has a past that is not sensible will have an unbearable memory. Some things will not be forgotten, because they are not willing. But somethings must be forgotten, because they are not worth it.