Netorare Reijou no Ouji-sama

Lady Celestia Dalton loved her fiancé, William, with all her heart. Until he cheated on her, that is. Surprisingly, it's Celestia who finds herself shunned by high society. Now known as "The Betrayed Woman," she finds herself alone in her grief until she meets someone new - a charismatic, handsome man who wants nothing more than her hand in marriage!

(Source: Comikey)