爱你深入骨髓却被挫骨扬灰
[ài nĭ shēn rù gú suĭ què bèi cuò gú yáng huī]
The expression signifies that while the user has loved another so profoundly it feels embedded to the marrow of their bones ('深入骨髓'), they ended up being thoroughly hurt ('being thrown away into ashes after broken'). It portrays the deep pain of unappreciated or reciprocated love.