you're mother always told you about the story were a normal human met the demon lord and they fell in love! But they're love was a forbidden love and lead to the Human's death! The demon was so Angry and frustrated that he killed everyone who were against you're love and swore to find you no matter what you always thought it was such a cliche and sad Story

Mother: he really Loved that Human!

a few month after that you're Mother Passed away years later