why Ragav Mary Pakki

Why Ragav Marry Pakki. Did he cheat her? I don't think so. I know that Ragav Love Kalpi too much. So Why he marry pakki. We know that Ragavs mother was with Pakkis parents custody. there is a chance to blackmail Ragav. They tell him if he need his mom alive, he should be marry paakki. Ragav doesn't have any choice to choose Kalpi. He need his mom. So He say yes to marry paakki.