It may probably go with 'Aiena' movie track where she will try every thing to win Ashu back but surely Hero Ashu will get her true colors and he will take care of Nidhi.
Surely MU and other issues going to create between AshNi due to Mallu...as Ashu will give more time / importance to Mallu due to her current halaat and that will irritate Nidhi...so problems between AshNi over Mallu.
I strongly feels, the show has lost the main concept of 'Kuch toh log kahenge' factor...the main theme as to issues between Age-gap love relation and the society issues, mutual understanding / compromises to be made in such relations. Instead its heading towards Hero_Heroine (Ashu-Nidhi) with few villains like Mallu, Rohan, DB who tries to break up AshNi ...a very much used track in many movies and daily soaps.
It may possible, with Mallu track they will open up Baba's house thing, Mallu's bro Aditya's deeds to Nidhi during CB heart attack and Mallu's earlier deeds to Nidhi... Hope they will handle it properly and with less negativity.
It also seems that DB over-love for Nidhi is also create some problem in AshNi relation. Now CB needs to be firm and should tell DB not to interfere in Nidhi's life and send DB on YATRA.
Let society talk about AshNI...and let AshNi face 'LOG' factor. Not needed any specific villain to test AshNi relation for their personal benefits.