相守许下今生相爱过完今生
[xiāng shŏu xŭ xià jīn shēng xiāng ài guò wán jīn shēng]
Which means something like 'making a pledge to stay together in this lifetime, loving each other and completing this lifetime together.' It expresses dedication to an intimate relationship until death parts them, vowing eternal devotion during one’s mortal existence.