For Madhu the most important thing is to be with RK and get married to RK. Her self respect, RK's trust, or whether they understand each other, what kind of life they can have , how this will affect her family or anything else just doesn't matter. Bas the marriage is all she wants. So even if RK doesn't believe her and trust her, Madhu will be happy if RK marries her this time. He just ahs to say he will marry her and Madhu will be ready.
So for this reason I'm saying marriage will happen. RK for his ego, Madhu cos this is all she wants.
And this time no public humiliation will be there. Not even after marriage public humiliation will be there. Whatever will happen might happen within closed doors and RK is not going to forgive Madhu for even thinking about taking revenge or to make RK learn a lesson. For him only he has a right to these kind of things. Not Madhu and Madhu will obey every whim of him feeling guilty for what she was going to do and will be the doormat and the puppet of RK for the rest of her life.
I don't think it will be Sultan and his mom who will make Madhu dance to their tunes. Madhu will always dance to RK's tunes.
So the same thing again and again.