The very fact that Milind 'hates' Prachi so much and refuses to divorce her should tell Ayesha how much he really loves his wife. They say that the reverse side of hate is love and vice versa.
Even when Milind wanted to take his revenge on Ayesha, there wasn't such bitterness. This time his need for revenge is deeper because his love is as deep.
If I were Ayesha, I would be worried stiff. I'd ask myself why Milind feels so much hatred for one whom he professes not to love, why he's hellbent on exacting so much revenge on someone he cares too hoots for, why he wants to torture to the inch of her life.
I would also remind myself that Milind never ever said he loved me when even when he was running after me in the past.
Yes, I would be very, very frightened!