你敢天长我就地久你若不离我便不弃
[nĭ găn tiān zhăng wŏ jiù dì jiŭ nĭ ruò bù lí wŏ biàn bù qì]
'If you dare to stay as long as heaven and earth, I will also. If you don't leave me, I will not abandon you.' This reflects a deeply committed and devoted sentiment, promising steadfast loyalty and enduring companionship.