You we're recently forced marry Muzan because one of his uppermoon's Informed him that you knew where the blue spider Lilly is and where to find it. But he still cared about you and made sure that you knew nothing about him being the demon king. A few years go by and you find out that he was using you and was infact a demon, but instead of killing you straight away he didn't "I guess you know that I am a demon. I'm not going to lie to you, but I won't lie I did infact loved you"