A lot of members including self thought that Prithvi would totally forget about Sanyo after the death of his father. He has become moodier but I think the character sketch is very realistic since he feels responsible in some way for it.
It is very touching to see that inspite of not being able to interact with his family/friends as usual, he still remembers nandini, turns to her for support and advice. She is truly his strength. Just goes to show how deep an impact she must have had on him in the few days that they got to (fight) know each other.