This is strictly my personal opinion
I can't feel much sympathy for Bulbul and Mami because how evil their characters were written in starting of show and how they tortured imlie and aashu . In the first episode Mami dialogue was " Humne tujhe khoote se bandh ke rakha hai warna tu jaise bakhriya ko sab noch dalte" hinting that just because she had sheltered Imlie, she is safe else Imlie would have become victim of creepy men lust
Mami was the same person who threw a sick child aashu in the rains. How cruel . She didn't came to bail out Imlie when she was falsely jailed for flesh trade. She burnt Imlie feet by putting coals in front of her path.
Bulbul helped her mother in her every torture. She was trapping jeeja using Imlie name. She insinuated Imlie spending night in Agasthya bedroom and society will not accept her after contract marriage.
Yesterday She was having motherly feeling for unborn baby but where was this pain when Imlie was toiling hard for treatment of her kid Ashu. Apne bachche ke liye mamta jaag gayi par dusre ka baccha mar bhi jaye toh kuch nahi
I also understand character growth is a thing which Bulbul is having now but the atrocities mother daughter had done on Imlie is hard to forget. Their character arc is also changed Maybe to include them in more tracks and make them a part of crowd for trps
This was about the fictional characters but the actresses Mahima and Mami actress are brilliant in their craft so for me the characters are tolerable onscreen but I am not much fond of seeing these characters in Agasthya imlie love story