她好幸福她有个爱她的他
[tā hăo xìng fú tā yŏu gè ài tā de tā]
It depicts a woman's ideal romantic life, which means 'She’s so happy because she has someone who loves her', reflecting people's envy towards such harmonious, warm, intimate relationships. Perhaps, someone using this nickname could long for similar sweet relationship like hers. Meanwhile, we also should know there may be some irony in the statement as well, since many who say this often lack this type of happiness themselves and instead only witness others’ joy.