But somewhere we have and are already witnessing the footprints of this 'obsessive' side of him. Since he met her initially at his party and from then on he's eyes have been following her diligently like a hawk.
Ridhima may be under the illusion that she's entered Vansh's life under Kabir's instructions but it's actually Vansh who's allowed her the chance to step in. He's been like a shadow consuming her from every angle till their marriage.
This obsessive side of him we saw, but he didn't like her. Only now will he be obsessed with her, I just hope he doesn't cross some boundaries (like Kabir). Everything is ok just that Riddhu is not put in danger, because of his obsession.
I agree that Vansh allowed Riddhu to enter his life and his house. He made that clear to her and let her know. Yes, he is aware of everything that is happening, we see a little less these days Vansh how is in control, but that Vansh will return soon and he will be extra.