I Am a Ruthless Knife

There are laws in the world but they are ruthless. This sword has emotions but it is lawless... A thousand years of swords, a thousand years of loneliness, the world is cold, fate is ruthless, only love is worth protecting. The male protagonist of the story, Tan Xin, is a sword resurrected from ancient times. From being willing to bear the world for love, to cutting off love step by step, how can he achieve positive results due to the impermanence of reincarnation?