A saint who has been summoned to another world cries "My boyfriend is dead" and won't work for me. By the way, that dead boyfriend is me in my previous life.

Edward is reborn and lives a carefree life as the third prince of the small country of Astraea. However, his life changes drastically with the appearance of a saint summoned by the goddess. Edward, not his brothers, is chosen to be the caretaker of the saint, whose mental state is reflected in the weather. When he asks her why she is crying, she says, "My boyfriend died." He told her, "That can't be the real reason you're crying. Because that dead boyfriend was me in a previous life!" A love comedy about a prince and a holy priestess, both of whom were reincarnated in a different world! (Source: Comic Meteor, translated)