久爱不变久伴不离
[jiŭ ài bù biàn jiŭ bàn bù lí]
Jiu'ai bu bian, jiu ban bu li (Long-lasting love remains unchanged and enduring companionship will not leave) expresses a profound commitment to everlasting love and unyielding companionship. This conveys someone who values loyalty and deep affection in relationships over a long period.