人会变天会黑三分情七分骗
[rén huì biàn tiān huì hēi sān fēn qíng qī fēn piàn]
The phrase translates as people can change, just as the sky can turn dark, emotions are but a minor part while deceit often plays a larger role. It reflects a cynical view on relationships, implying that genuine feelings are often less impactful than dishonesty.