陪你陪到天荒地老愿我与你心上永居
[péi nĭ péi dào tiān huāng dì lăo yuàn wŏ yŭ nĭ xīn shàng yŏng jū]
'Accompanying you until heaven and earth wither, wishing for me to reside forever in your heart'. It indicates a desire for eternal commitment and an unchanging place in someone’s heart, expressing deep and long-lasting affection.