情长不过百年
[qíng zhăng bù guò băi nián]
'Qing chang bu guo bainian' means 'Affection lasts no more than a hundred years'. In the perspective of this username, no matter how deep the emotion (usually refers to love), it won't last longer than a human life span. Here, 'a hundred years' is just a hyperbole of a full and long lifetime.