Anyone asking a married woman to come and live with him, is disgusting. Prerna loved him, she had an image of Anurag, which is shattering with his every move
Actually, Anurag doesn't even consider her married to Bajaj. That it is some kind of a nightmare they both need to wake up from. So he is thinking that he can blackmail her into living in his house, therefore negating that dreadful marriage or whatever it was. Once Prerna is away from Mr. Bajaj, she will come to her senses and realize how utterly ridiculous the sham marriage is and Anurag will be right there to pick up the pieces.
He wants to drill some sense into Prerna and getting her away from Mr. Bajaj is the first step.
That's where Anurag is coming from.