暖心暖肺终暖情凉心凉情终凉人
[nuăn xīn nuăn fèi zhōng nuăn qíng liáng xīn liáng qíng zhōng liáng rén]
This expresses the contrast between initial warm feelings of comfort leading to deep affection and subsequent cold emotions resulting in emotional detachment. It describes a cycle from genuine caring to eventual apathy.