Gabe's reaction to part 4 ch 1-3

The opening chapters of part 4 are very intriguing. It is clear that the plot is beginning to unravel as more and more people begin to suspect Raskolnikov of his crime and he slowly begins to accept this reality. In chapter 1, a new character appears called Svidrigailov. He is a sketchy character and his significance in the story is not very apparent. He is persistent and has low morals, which is shown when  he offers money in order to be with Raskolnikov's sister, Dunya. Raskolnikov also views him as insane, which I find interesting as they have similar qualities. I am curious to see what this man's significance is to the development of the story. Dunya once again shows her strong, rational, and independent qualities when she finally leaves Luzhin and decides she cannot tolerate him anymore. Raskolnikov reacts strangely to this. At first, everyone is happy at this decision and there is a celebratory atmosphere amongst them all. However, Raskolnikov quickly becomes anxious and seems preoccupied like always. After showing noble and caring characteristics by offering to protect Dunya and his family, he suddenly changes his mind and leaves Razumikhin in charge of protecting his family. This confused me as I am not sure if his intentions were caring or selfish. He may be feeling too guilty and does not want to cause any harm to his family, but he may also be trying to run away as he is starting to realize that too many people are beginning to suspect him. At the end of chapter 3, Razumikhin is sure that Raskolnikov is in fact the murderer. I am interested to see what he will do about this new discovery, Raskolnikov's furture plans, his family's future, and Raskolnikov's fate.