it is ofcourse quite obvious that jai has really started caring for bani...he does not want to see her get hurt in any way. he is not aware of her feelings for him....and does not even realise his feelings for her.
basically he is just too overwhelmed with the idea of bani getting to know the park road secret. he feels that she will get hurt, start to hate him and as a result of this hatred look back and feel that her relationship (and that night ofcourse) with him was a big blunder, and so she will strat feeling suffocated in this relationship. so he just wants to set her free to save her from all this.
my take is that he will start making plans for her departure....like divorce papers and discussing it with bani and stuff.....but while doing so he himself will start feeling that once she leaves him he will really miss her. like u know those kinds of scenes in hindi movies where before the divorce papers arrive one is really excited.....but when they actually reach the court to sign the papers they are not very keen on doing it.
but why is he always thinking abt bani.....why doesnt he ever think abt what he feels. anyway......