It could be taken that she kind of blame herself for what Sultan was feeling. In a way isn't she to some extent responsible?? and trying to make her feel not responsible by convncing herself maybe.
I thought may be Madhu will refer Aaryan to Sulthan... in that scene but she didn't... Instead she said if you learned whats love from me.. then please respect it... her love is RK... It was OK to me.. bcos that time she was thinking only about RK's life.. and after that she was kind of shocked the way Sulthan got killed by RK... later she was worried for RK's arrest... Missing him and feeling sad for him... Everything happen so fast... Nobody in that house is cared or worried for Aaryan or Kakka or Meeraji but only for RK... and when she got some time of herself with Padmini.. she thought about Aaryan... May be...🤔