他心似海而我早已溺亡
[tā xīn sì hăi ér wŏ zăo yĭ nì wáng]
His Heart is Like the Sea, and I Drowned Long Ago: This suggests a deep, overwhelming love for someone where their heart (his heart being like the sea) feels vast and endless while the user feels like they've drowned in it - overwhelmed and possibly lost beyond return.