I'm A Villain, But I Saved The Female Lead

i transmigrated into novel as villainess rubelina, whose plan to marry the crown prince is stolen by the heroine avonne. i thought that i could live happily as long as i didn't get involved in the love of the heroine and the hero gilart, and as a result of living without worrying about it, the heroine and the hero were safely engaged. just when i was taking it easy, thinking that my role was over, the heroine suddenly came to visit me. “i want to return the engagement with his highness the crown prince to a clean slate!” um… i seem to have misunderstood your role, but i'm a villain and i hope you'll be happy forever…!?