"Kimi wo Aisuru Ki wa nai" to Itta Jiki Koushaku-sama ga Naze ka Dekiai Shitekimasu

Elsa, the daughter of a fallen aristocrat, receives news. It was a marriage proposal from Julius, a very elite nobleman. Elsa is wondering," Why would such a distinguished man marry me"? But after the wedding, Julius, who had been kind and gentle up to that point, changed completely! In a cold voice, he tells her," I have no intention of loving you".
(Source: MangaPlaza)