Rishi tanuja forced marriage

I don't rishi tanuja will marry happily anytime soon. So I was thinking why will rishi marry tanuja when he listen bani & Neha's plan & consider tanuja evil 2.his marriage with tanuja will forced one only . There should be any solid reason 4 him 2 marry tanuja. As beeji is 2 fond of tanuja may coz of her , or bani Neha planning. Any random guess