冷不过人情凉不过人心
[lĕng bù guò rén qíng liáng bù guò rén xīn]
'Colder than human relations; colder still is the human heart' signifies profound feelings of disappointment with interpersonal relations. It implies that while external social ties may be cold, deeper dissatisfaction lies within the heart, hinting at deep personal disillusionment or betrayal.