他不懂你的心假装冷静他不懂爱情把它当游戏
[tā bù dŏng nĭ de xīn jiă zhuāng lĕng jìng tā bù dŏng ài qíng bă tā dāng yóu xì]
Translating roughly to 'He does not understand your heart, pretends to be calm; he doesn’t know what love is, treats it like a game.' This nickname suggests someone who feels misunderstood in love or expresses frustration towards an unattentive partner.