我一個人過的很好
[wŏ yī gè rén guò de hĕn hăo]
'Wo yi ge ren guo de hen hao' simply translates to 'I am doing very well alone'. The character who adopts such a username wishes to show that they are happy with their single status, perhaps emphasizing they can cope without the need for others in some area of life (love, companionship etc.)