Chiru is a character with a fighting mindset. Chiru is a good nature person but he commits some murders. From where is he imbibing these types of personalities and why??

So, the story begins with a guy named, Chiru. Chiru is a conflict minded character, and he hallucinates his girlfriend Riya who is actually dead. Here it's shown that he is consulting with a Therapist, Polashi Ray Chowdhury. Chiru does not know he is doing severe crimes,well he does not know about this because after committing the crime he just forget everything has happened. So the Therapist appoints a Psychiatrist who will deal his case again. But this time the Psychiatrist is a undercover police officer who will not only deal his case but really get out the truth behind this hallucination with giving proposal to Chiru.And after that Chiru tells everything to her and ran to home. He does not know that already the lawyer and police are there in his home. So they just caught him and put him to jail. Every character of him depends upon situations.But in nature Chiru is a well maintained man, and a loving one too. He committed some murders and that's the scenario we are dealing with the stories; from where this kind of Personalities he is holding and why?.