"Nagaland-cī rājadhānī koṇatī?" Arjun is suspicious of the story told by Bhaiyu, Shali's fresh-out-of-prison brother summoned by Balaram.
What is Bhaiyu's assignment? His touching of Nanda and his interest in Priya being grown up both suggest that he specializes in sexual assault.
Shali, by her own admission, isn't aristocratic like Nanda, and now she has an ex-convict for a brother. Shali herself put poison in Arjun's soup, but she's not quite as dangerously criminal as her murderous husband, Balaram, or even her foot-breaking vigilante brother-in-law, Arjun. The Kawathekars really don't have moral high ground to look down on women who marry into the family for status and money.
Is that Arjun's real reason for being mean to Savitri? He told Priya that he rejected so many brides because they're not interested in him, only interested in his status and money, but if Arjun thought that Sneha was like Shali, who tolerates Balaram's infidelities because he's rich, why did Arjun think that Savitri claiming an affair with Arjun would deter Sneha from marrying him?
When Arjun was looking for words to say to Savitri, planning a visit to her mother, and making origami for her pleasure, he must have thought about proposing marriage. Arjun who sneered about what Savitri might have done in a hotel room with Naresh, and later kidnapped Naresh to force him to marry Savitri, probably thinks that anything short of marriage is dishonourable. Arjun does not want to behave like Balaram. He knows that Krishna'i and Vidyadhar and Priya want him to marry Savitri, and his scenes with Priya showed that falling in love with Savitri made him happy.
It was the realization that fantasizing about Savitri distracted him from work that made Arjun insist that they have to be professional and he doesn't even like her.
Did Arjun in the past cause problems at work because he was infatuated with someone? Is that guilt what made him repeat, "I'm sorry" in his sleep?