Isn't this what Kumud is doing currently? She's made her stance very clear to Saras. She will standby her marriage and make it work. Her loyalty lies with Pramad but her actions are deceiving her noble intentions. Why did she want to stop Kusum from revealing Saras' truth to DukhBaa?
Truth is that she wants to keep him under wraps because she derives her strength from him. She rose to become the strong Kumud after Saras threw her a challenge to do so.
Pramad is no way turning positive anytime soon. He has a plan churning in his mind which is why he listened to Kumud's story. He will use it against her and that's where Naveen/Saras will come to save her. There is no way in hell a man like Pramad would change his ways so soon! He wants to get rid of Kumud. Period.