I think the book, Sick Wife Is As Sweet As Honey, suits your needs.๐The male protagonist was insidious and paranoid. He only doted on the female protagonist. The female protagonist was sweet and sickly. Whoever tried to snatch the male protagonist from her would be killed. The male lead had many women in the beginning, but in the end, he was only devoted to the female lead. I hope you like this fairy's recommendation. Muah ~๐