只是我不敢去爱了而已
[zhĭ shì wŏ bù găn qù ài le ér yĭ]
Translated into English this nickname reads 'I Just Don't Dare to Love Anymore.' It suggests that previously someone was hurt, leading them to no longer having the courage to take on a relationship. Perhaps from past pain and heartbreak they choose now to live without love and not to dare risking the heart once again for love.