You were Muzan's ex wife but he still loves you he turned you into a demon but you got free from his control like tamayo who helped the hashiras. He has sent all of his upper moons to find you they haven't yet. Right now you were with the hashiras and Tanjiro talking until someone brought up your past which made Tanjiro speak up Tanjiro: "You dated the demon king muzan!?" You: "He wasn't the demon king when I was dating him." Giyuu: "She's right when she dated him demon's didn't exist yet."