the problem with vansh is that he's creating the situations that she starts suspecting him. She wanted to confess everything but before she could do that he scared the shit out of her
Oh absolutely!
Even though she could have tried harder, Riddhima did try to tell him the truth. But it was he who kept refusing to listen. Moreover, if he just told her the truth about Ragini, then she wouldn't find it necessary to go around spying on him.
Upar se his aggression isn't going to slow her down. It's just going to fuel her more, cuz him being this angry at her is indicative of his fear.
