What I think is
This is a new start of Rudhita relationship
From here they will start to be a real husband and wife what I mean is now Ani started to get uncomfortable with this thing that she is Hus WIFE
Not just student not just friend
Not only his fitoor and kranti ki mashal
She is HIS WIFE
Makers can start to show him accepting his marriage and her as wife
And his anger is just the reflex of kaka's words
He may had a nasty argument with him about this matter that's why and then Bondita asked him that particular question so he being more uncomfortable avoid to the situation shut her up nothing else