怣你失你心忘我亡我心
[yóu nĭ shī nĭ xīn wàng wŏ wáng wŏ xīn]
'Si Ni Shi Ni Xin Wang Wo Wang Wo Xin' suggests the sentiment of loving and forgetting each other deeply: 'Missing you and losing you from my heart and me disappearing out of your mind.' It expresses the profound pain associated with loss in a relationship or unreciprocated feelings.