一把相思灰不知相思悔
[yī bă xiāng sī huī bù zhī xiāng sī huĭ]
Roughly meaning 'I Have a Fistful of Ashes from My Yearning; Yet Regret Isn't Enough to Ease Such Pain'. The phrase expresses unrequited love with regret, sadness, and yearning. One can imagine this person may have experienced intense romantic pain, reflecting on lost love or broken relationships.