曾经的你是我的所有现在的你是我的一切
[céng jīng de nĭ shì wŏ de suŏ yŏu xiàn zài de nĭ shì wŏ de yī qiè]
Translated as 'Once you were all I had; now you are all I have left', this username highlights the intense attachment and emotional dependence on someone, emphasizing the continuity of importance this person holds despite any changes over time.