what you are saying is not true, when the show started Anjali was all ready to go to their new house with shayam. it is shayam that manipulated the situation siting the is all the time out of state due to work and that Anjali will be alone. Arnav was willing to let Anjali live in her own house at the time because the trusted Shayam to be a good husband and look after anjali. but he retirated at that time because he didnt want her to be left alone in a new house. so he sugested that Anjali live with them for the time that Shayam is out.