你若不离不弃我必以死相依
[nĭ ruò bù lí bù qì wŏ bì yĭ sĭ xiāng yī]
Means 'If You Don’t Leave Or Forsake Me, Then I’d Live And Die With You.' This indicates extremely faithful attachment and unconditional commitment in romantic relationships, vowing dedication and permanence if the relationship lasts unbrokenly.