From the Peony Pavilion by Tang Xianzu. The sentence "I'm surprised that I don't miss my lover because I'm already in my bones" is based on "I'm surprised" and it's natural and appropriate to express my deep and sincere feelings for my lover with "I don't miss my lover".
Peony Pavilion is a legend (script) created by Tang Xianzu, a playwright in Ming Dynasty. Published in forty-five years of Wanli of Ming Dynasty (16 17).
The play tells the story that Du Liniang, the daughter of a government official, fell in love with the scholar Liu Mengmei in her dream, but died of injury. In reality, she turned into a soul looking for a lover, fell in love with a ghost, finally came back to life, and finally became one with Liu Mengmei forever.
This play is one of the outstanding works in the history of China's traditional operas, which is closely related to The West Chamber, Yuan Dynasty,
The Palace of Eternal Life is called the four classical plays in China. The play has elegant wording and beautiful language.
Resources sogou encyclopedia entry
Peony Pavilion