你何尝知道我舍不得你难过
[nĭ hé cháng zhī dào wŏ shè bù dé nĭ nán guò]
'你何尝知道我舍不得你难过' roughly translates to 'How would you know how hard it is for me when you are sad?'. It reflects profound empathy and care, wishing the beloved not to feel down while expressing deep regret about their separation.