"Kimi wo Aisuru Kiwanai" to Itta Jiki Koushaku-sama ga Naze ka Dekiaishitekimasu

Elsa, the daughter of an aristocratic but poor family, received a marriage proposal from Julius, a high-class nobleman and a future duke. "Why would such an eligible bachelor be interested in me?" Elsa wondered, but she decided to accept the proposal anyway. After the wedding, Julius, who had appeared gentle and courteous, suddenly changed! "I have no intention of loving you in the future," he announced coldly!?

(Source: Comic Polaris, translated)