There was an old movie that dealt with a man's loss of memory. He had been injured in World War II and suffered amnesia. Consequently, he started his life over in a town where he knew no one and no one knew him. However, he has occasion to meet a woman there who had also moved. Coincidentally, she is his wife, but, of course, he does not recognize her. Since she has been told that he has been missing in action by the government of her country, the woman, too, is amazed that he is alive. (She moved to restart her life, as well.)
The rest of the plot is the woman's efforts to care for him and find something that will bring him to realize his true identity. Finally, she finds something and he is no longer "lost."
Perhaps, then, you could write a narrative that involves someone who has lost his/her memory temporarily, but the love he/she has for another person brings the person out of his/her lost state and restores memory.