我停止心跳时才放弃你
[wŏ tíng zhĭ xīn tiào shí cái fàng qì nĭ]
It literally says 'Only when I cease to have heartbeat would I abandon you.' It signifies extreme loyalty and undying commitment towards another soulmate, highlighting that death can only end such affection - the deepest and purest kind of love expressed using the extremity of ceasing life activities.