I’m a Villain, but I Saved the Female Lead

The evil heroine of the novel, after losing the opportunity to marry the crown prince, the heroine plays the role of the evil Rubelina in the novel and lives in a state of turmoil..She believed that she could live happily as long as she did not interfere in the romance of the heroine Avon and the hero Geralt, so she lived her life without any fears.As a result, both the heroine and the hero successfully get engaged. Thinking that her role is over, she is spending her time freely, but suddenly, the heroine comes to visit her.
“I want to cancel the engagement with the Crown Prince!”
Hmm…it seems you misplayed your role. I am the villain, and you are the heroine who will live happily ever after…!?