细水流年与君同繁华落尽与君老
[xì shuĭ liú nián yŭ jūn tóng fán huá luò jĭn yŭ jūn lăo]
'Through the tranquil passage of time we remain together, as all splendor fades we grow old together.' These words represent unwavering companionship over years and through changing times, suggesting loyalty or dedication.