First should applaud Aniruddh for standing so strong in his decisions. He was not even moved a little by their accusations. He is right and anything else doesn't matter to him.
He went to Kaka because he knows very well that he won't allow this to happen as nothing wrong happened. He was like 'Ask my kaka, he won't recommend this. Bon will be his daughter-in-law forever'.
This put a clear picture that what he said to Bon was just words of anger. He didn't want to accept that he misses her but also not leave her forever.
Everyone in the house remembers Bon even after her mistake showing how they are loving her.
One thing is clear, whatever may happen, Bon will return to Haveli for her first Durgapuja with RCs.
Anyway, they will agree to the engagement that won't happen at all.