His realised shes popular outside the house now and many people are rooting for her so he now wants to ride on her popularity and is being all goody good with her and trying to convince her that Shukla is manipulating her.
This guy is so insecure of Shukla's popularity in fact anyone's like Fifi aka Abu jee rightly said in a interview recently. He doesn't have confidence in his fan following therefore wants to ride on Sana's voters by being shown with her more. Second week he threw her away like a tissue and when he realised shes most popular amongst girls for BB fans his after her. But Sana is riding on Shukla's votes as well shes not as innocent as she acts I know and see that.