Imagine you liked this person and his thoughts, then you meet this person but at the end he is not what you loved for years. That to me looks like manipulation. DS used HJP's image to leave a mark on Dal Mi, which means he used those letters and her memories of those letters to be what Dal Mi would like. To me that looks toxic and even bizzare at how he is not that good of a human being.
Didn't expected this.