I am also disturbed about this. Its just that even viewers can see that Anu as a character even at his lowest yet, still would not do such a thing where he could end up killing someone....In the accident incidence too he harmed himself not someone else....If this had been some other milder thing where Bajaj's life was not in danger at all then its understandable....but murder is just not something Anu would be capable of....And if Pre believes this then I would be dissapointed. I mean I can understand her having trust issues after that accident thing....but is Pre really going to believe Anu capable of attempting to put some one on fire.....If the situation had been reversed I would have been just as dissapointed if Anu did the same to Pre too...Both of them at least has to have this much trust between them if nothing else.
Prerna's trust on Anurag has been shaken very badly after his crazy act. What she saw was an Anurag who almost killed himself for her and wanted to frame an "innocent" Bajaj for it . We know that Anurag called the police because he knew Bajaj hit him intentionally. Prerna does not know that. All she saw was the love of her life doing anything in his desperation to throw the 3rd wheel out of their lives.