不经意的思念是那么痛痛到回忆根本无法触碰
[bù jīng yì de sī niàn shì nèi me tòng tòng dào huí yì gēn bĕn wú fă chù pèng]
'Unwary longing can hurt so much that it hurts too much to touch those memories.' It describes someone haunted by memories of the past which evoke strong painful emotions or sadness upon reminiscence.