他是暖阳却不是我的太阳
[tā shì nuăn yáng què bù shì wŏ de tài yáng]
'He is a warm sun, but not my sun.' The nickname conveys that although this person may bring warmth to others (like sunshine to everyone), for 'me,' he has never provided the special attention and love expected from 'the sun.' It symbolizes deep yet unreciprocated affection.