I can't comment much on "that girl" wala track because it is clear that Raghav's reputation got maligned due to a girl. It is not always a guys fault. If he believes that some girl did something bad to him in the past it must be true coz the Raghav you see today was not like this from birth. That girl must have done something malicious to Raghav for sure that's the reason for his lack of trust in women.
Meanwhile Keerthi, though she was a teenager she was old enough to understand and feel the loss of her family members. Tell me if a mother believes that everything happened due her eldest son, what should the young daughter of the household believe. She too will consider him the only reason for their miseries. And again she was too small when all this happened and along with Raghav she too had to say good bye to her childhood days pretty early and take up the responsibility of her mother and both their lives. Think about the harassment she had to face at such a young age (remember people attacking in flashbacks). Which girl won't blame the person who is believed to be the reason for everything happened to them?
I remember Farhad saying that Anna had moved to Hyderabad at some point. I have a feeling Amma and Keerti had to leave their previous town/city in order to get away from all the humiliation and misery and he must have moved to the same city just to be near them. Over time, he found a way to build a business and become the don. He has clearly kept a close eye on Keerti and her safety over the years. Leaving your hometown is hard, whatever the reason. I am assuming they have also lost touch with extended family and old friends since then.