The final separation happened because he believed and trusted Ca's words over Anupama's. It happened as he called her children from first marriage as baggage and accused her of infidelity with her ex -husband. He even pointed that his marriage was a hasty decision.
Funny how people believe separation was because of one situation
Both Anuj and CA saw her abandoning CA again and again and again. No one needs to tell Anuj anything, he SAW her abandoning CA many times. So did all the audience. It's not one situation at all, but her entire behaviour during the 3 year marriage.
Accused her of infidelity? What? When did this happen? Kuch bhi.

and then has the courage to ask kyu kyu kyu mujhse nafrat karti hai CA. Behen, tu chali gayi ..you didn't even bother to put your kid through therapy but you decided to put your cheater son through therapy and your abuser ex through therapy to mourn over sons loss. 
So let us wait till the right time comes to discuss whether MaAn does these rituals together or not at her wedding .
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