confusion.. confusion..

this question is runing in my mind from d day the gudiya factory raaz was shown.. i mean hw can this be possible??? asad and ayyan know each other when najma was not even born.. so rashid had an extra marital affair with shirin previously? or ayaan is not his child??? a huge confusion is there..coz in the flashbacks it was clearly shown day rashid came to his house with ayyan 1 day.. and after the birth of najma.. he left... if this was soo then i think rashid is not fully innocent...