你会发光但不是我的太阳
[nĭ huì fā guāng dàn bù shì wŏ de tài yáng]
This phrase suggests a recognition that while a person might be impressive, talented or radiant, this does not diminish the user's view on their significant other who is uniquely important to them just like how no one else can replace the sun in providing light and warmth.