Hametsu no Seijo wa Unmei no Otto no Dekiai kara Nogaretai

"If I had never met you..." Those were the last words Rosa heard from her husband, Claude, on the day he was killed. Although her marriage was politically motivated due to her failure to become a saintess, Rosa truly loved him and believed she was the cause of his death. Overcome with despair, she lost consciousness. When she awakens, she finds herself six years in the past! Determined to save her love, she resolves to avoid their marriage, but fate has other plans for them. (Source: MangaPlaza)