Remember Bani's stupid plot to get Jai to hate her - asking for a divorce with alimony, insulting him in front of every body etc. etc. All for his own good or so she thought. Jai remained devoted to her inspite of all that. But it was the miscarriage of his child ( which he thought was an abortion) which had driven the last nail in Jai-Bani coffin (though temporarily). The after effects of that - in the form of a supposed ONS - is still felt on their relationship.
Now I think it will be Rano's miscarriage which will wake up Bani from her stupor. She will become a much stronger person but alas Jai and his stupid ploy to make her hate him so as to get some reactions from her will then really start working and drive the wedge in their relationship even after the ONS is proved fake.
Jai and Bani really need brain surgery - they cannot seem to think straight. All their stupid ploys in the interest of the other is only getting us crazy.