Who Said My Wife Is a Ghost?

My name is Fang Yan, I am married, but my wife is not a human being. When we first met, we got married. The second time we met, we became friends. The third time we met, we became strangers. Until the day I died, she held my heart and said to me: In the next life, you come to me! My wife is not a human being, but who said she is a ghost?