I Became the Empress Doomed to Die at the Hands of the Tyrant

A tyrant who kills his empress to wed another man. And that tyrant is my husband. 'I' have become 'Mabel', the ill-fated empress in a tragic Boys’ Love novel, destined for a miserable death. According to the original story, the tyrant, 'Raven', will soon meet his male lover, 'Yunus', and execute Mabel. Before that happens, I must divorce my tyrant husband, no matter what it takes! But then— "I'm sorry... I hope this eases your heart." Why is he suddenly on the regretful male lead route?