It's not that Abhi or even Manjari are calling Ak a murderer. It's been six years. Abhi understands both of their perspectives. He understands Manjari and her pain of losing a son. Manjari blamed him too for Neil's death cause the fact is, she just needed someone to blame. That's how these situations end up being like. Abhi thinks that if Ak apologizes, things can get back to normal for everyone. Manjari can forgive her and finally move on.
He even demonstrated today with his apology to Abhir. He himself is not at fault here, but he apologized just to acknowledge his pain and whatever happened. That is at least my understanding of what he wants to happen. He wants Ak and Manjari to make up, basically.
And Ak's sentence was that not all mothers can protect their children, so he drew the conclusion she was talking about Manjari and Neil, when she was actually talking about herself and Abhir. Not a giant leap, but because Neil has been forgotten in the narrative, it does seem like it.
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