1.may be bhanu pratap had the idea in his mind from the start and he doesnot want to tell his sister -in-law.In last weks episode he did say that he will do the kala jaadu but not tell jiji about it,because he is wants jijito think that she also is participating in the game.he did this to shakti too.
2.vikram met raashi and at that point of time he didnt want to reveal himself and also confuse raashi who had a memory loss.he might be thinking thatshe doesot remember all things as she was positivly responding to him during the treatment.
3.vikram was trying to get close to vrinda and pandey family and when all doors fr him were closed by kashinath to meet vrnda,he could only be in touch with vrnda and impress the family by saving raashi.raashi was fond of him so he must have thought that raashi has forgotten everything or she loves him still.
4.vikram and bhanu had a plan.they wanted
vrnda to feel very good before they start torturing her.it also might be due to he fact that somewhere vikram is really in love with vrinda?but he is doing this for his father.
5.may be after being with his friends and drinking, he lost it or bhanu told him to so that they come two days before their honeymoon and an issue can be made out of it.
and now they are trying to finish kashinath by simultaneously destroying both his daughters. vikram may have been nice but after hearig about how his father spent his life in jail because of kashinath pandey and how his mather sufferd,he decided to join bhanu.
i feel so sorry for vrinda and raashi.both loved him so much and he did this to them.shame on vikram. [:x] and i really wish this vikram is a duplicate, because i want vrinda to be happy.i loved vrinda with vikram a lot.