Absolutely valid point - what did it take for Bani to break the last time - hearing Jai and Roshni in the same room. And at that time, she didn't even know what she felt for him except that it hurt her to see him with someone else. At this point, this may be the only trump card in Jai's hand.
Not that Bani has left Jai with any other option to get her to talk to him let alone reveal her intentions. Even his most sincere confessions and bhagwaan and bacche ki kasam cudnt get her to reveal the intentions , although she confessed her true love to her hubby!