After seeing yesterday's UK episode I somehow sense a "relation"between Roshni and Aditya.
Maybe Aditya, Jai, Sonali, Roshni were good friends when young and Roshni was going to marry Aditya but because she was very ambitious and money minded (like Pia) she hilted on the day and Jai had to convince his sister Jigyasa to marry Aditya to save face and so Jigyasa, Aditya and Jai all hate Roshni for that ???? Would make sense about Jigyasa coming up with the idea in the first place for Bani to sit in for Pia and also for her personal hatred for Roshni.
Jai too probably holds a big time grudge on Roshni for all this
What do you all think of this angle ?