I was about to post this in my analysis thread today, but it applies better here, so adding here as well.
Kehte hain naa - aurat hi aurat ki sabse badi dushman hai. It's true. Whether in personal or professional life, sometimes women are their own worst enemy.
It's things like these. Abusing another woman, treating them as crap, labeling them garbage, and attempting to kill them. Antara was fine with Manvi and MJ's affair as long as it was outside her house. But the moment she came face-to-face with Manvi, it was no longer outside her house. Now she had to react and she did. Diya is okay being the other woman in MJ's life and letting him have flings with other women, but the moment the other women speak up they are "giri huyi".
In a way, it shows the hypocritical nature of people. As long as MJ was keeping his affairs outside the house, Antara was fine with it. But the moment, that very affair came to her door, it woke her up. And she doesn't want to be woken up. She's happy being the trophy wife who believes that she is important. But the moment someone reminds her of that state, she sees them as garbage. She is also projecting herself onto them. Until Manvi didn't come to her door, she was happy being oblivious and pretending she was important, but the moment Manvi's shadow befell on her doorstep, it reminded her that she was a nobody in MJ's life. Just garbage.
With Diya, she's happy being the other woman and keeping her affair with MJ hidden from Antara. As long as Antara doesn't question her, she is fine. Yes it hurts that Antara calls herself the only Mrs. Roy, but Diya is willing to take that pain because she believes that she is more important to MJ than Antara. She refuses to see the truth, which is that she is a homewrecker. But the moment someone else enters MJ's life and becomes the "other woman", she is reminded of her reality and is unwilling to take it, thus this other woman becomes giri hui to protect herself.
Edited by Minionite - 5 years ago