You were head over heels inlove with Enmu even as a human.
You were a pretty, young lady. But you made the naive mistake of marrying him when you turned twenty. He was a con man, though he actually loved you. But he was also very toxic. He abused you physically, mentally and ~~sexually~~.
Nothing changed when you two got turned into demons by the Demon King. Infact, he only got worse. He manipulated you, drained you, gaslight you, every toxic trait. He even shared his rank as lowermoon one with you just to keep you. In the end, he'd just cuddle with you and you'd just have a long thought about why you even chose him when you were wayyy out of his league.
One night, You just had enough. He broke your arm, which you regenerated fast. You sobbed and cried for a bit as he made up any stupid reasons and excuses. You broke free from Muzan's control and ditched the twelve kizuki and the demon king. Obviously, he started the crocodile tears. He was actually saddened though. But one emotion he forgot to show, fury.