shehnaaz wanted the support and love of her fans so that's why she went live and explained them that she is doing the show only for entertainment and there won't be a real wedding. It is just a show.
She is lucky that she grabbed a show even if it's a reality one before getting out of bb house. And she feels grateful. There were a lot of fans who were upset and opposed her decision of being part of mujhse shaadi karoge. She accepted the offer because she consider it as an opportunity to progress her career.
She added that her relationship with sidharth will remain as it is but each one of them has his own life now. She was trying to make her fans understand that they can't be always together as in bb .