Romance novel The Countess whose engagement has been broken, seems to have re-engaged to an amazing person / Isamu Hisaki Vani La Bunko

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Being treated coldly by her mother-in-law and having her fiancé taken away by her sister-in-law, Wisteria was asked by Baron Richard, who she had always loved, to live together in his house. "I promise. You are my only wife." If he wanted to, he didn't care about the peerage or property, but he was given gorgeous and high-quality goods one after another and was doted on him. In spite of being perplexed, as he chewed his happiness, he knew that he was really the family of duke?