The entanglement in the twelve lives was God's punishment for them.
He and she were not supposed to be a couple, but he still loved her persistently.
She couldn't bear such overbearing love. The only thing that shouldn't be done was that he only revealed the love hidden in his heart after she fell in love with someone else. But it was already too late, everything was too late.
Unwilling to do so, he killed all humans in the world.
In the end, God's punishment came.
God punished them not to be together for eleven lifetimes, so he tried his best to free her.
In the last life, he still passed her by, but at least she fell in love with him, which was enough. He didn't ask for anything, even if he was with her in the end, he was willing to do so.
After twelve lives of entanglement, she understood his love and accepted him, but in the end it was not possible. He hurt her and she jumped off the cliff.
He was in pain, but still couldn't exchange for anything.
Only then did he understand: love means letting go, love means being selfish, love means holding her in the palm of your hand and taking good care of her, love means giving up everything for her, and love cannot hurt her.
Before she jumped off the cliff, she left a few lines of blood words: My way is not up to the Tathagata and I am not down to you, my way is not up to the country and I am not down to you!
He was heartbroken, but helpless. This was the promise she made to her mother.
Next to the words in blood is the love-killing jade he gave her, which is engraved with: My love for you will never change.
She still remembers his promise to her, and so does he.