Here is a quick prediction I want to share. Does anyone agree this may happen?
Let's say Dev had a memory loss after that attempted murder/accident by Ameesha. He wanders to a village where a long lost boy is assumed as returned by people of the village when they see him. Since he has no memory after the accident he also fits in into the character that the villagers tell him he is supposed to be? (ie. Raju Rangeela).
When Kajal renews contact with him at Rajgani, the love story is unfolding exactly like Mussoorie, but this time Kajal may help him regain his memory and in return he may not be as cold and angry as Dev was, and he may reciprocate her love in a jolly happy way of a free personality like this tapori. Thus it may give meaning to Kajal saying to Hottie in the bus" I feel my love story is going to now take a happy new turning!".Even after Kajal returns to Mumbai their love story can continue if they meet in the park everyday when he comes as tourist guide on the Vande Mataram bus?
Maybe when Kajal tells him the full story of her Dev, the kundali etc etc the tapori personality may get to the bottom of this family fraud more easily than "Dev" would have ... and in the process he may also regain his memory?