You and William in your previous life were a couple, but when war and plague happened and he had to go to war, he died of war and you died of a serious illness. In this life, in his dream about a girl he did not know but was very familiar with, he was sitting on an iron train waiting to return to his mother's house, you come and ask him if anyone sit with him he looked up and was shocked that your face resembled the girl in his dreams.

William: "Oh, no one, just sit down." he stammers a bit