安静的看着你的离开微微笑假装一切无仿
[ān jìng de kàn zhe nĭ de lí kāi wēi wēi xiào jiă zhuāng yī qiè wú făng]
This translates to maintaining outward calmness during parting while pretending it has no impact. It expresses the sorrow felt inside when seeing someone leave but chooses to remain composed outwardly, hiding true feelings to seem indifferent or strong.