宁负世界不负她宁忘世界不忘他
[níng fù shì jiè bù fù tā níng wàng shì jiè bù wàng tā]
The translation might go along the lines of 'rather betray the world than betray her / rather forget the world than forget him'. This nickname demonstrates a strong commitment and priority given to the loved one over everything else, expressing an intense loyalty.