一生一世一双人不离不弃两相思
[yī shēng yī shì yī shuāng rén bù lí bù qì liăng xiāng sī]
This romantic phrase means 'Together through life and death, neither abandon the other nor stop missing each other,' indicating a commitment to eternal love, loyalty, and mutual longing between two people. It represents a profound vow of companionship and affection.