after losing her child, now she has lost her husband's love also..
n madhu didnt hav any extra marital affair wid sultan coz wen madhu had met sultan, rk had once again broken her heart, n left her at the mandap..she was not in relationship wid 2 guys simultaneously.,rk had dumped her, still rk was feeling jealous n fought wid sultan at evry next meeting.plus it was clearly shown that madhu had no feelings lyk lov for sultan..c only loved his kid..bt here , in dis case, there iz smethng wrong in rk's mind..he iz thinking of ria as an option. while madhu iz still der..n iz convincing himself dat al he is doing is justified.