jai does love bani. its not that he is confused or doesnt realise it. its just that he hasnt said anything to bani or to himself as yet and even his thoughts/feelings abt her or abt that night have not been shown to us as yet....thats why we dont know that he loves her.....and ekta just wants to keep us guessing abt this until the actual confession scene.
see basically what MT said is right:
(1) Firstly, jai is in a dilemma abt what pia said that night. so he actually thinks that bani was forced into this marraige and its been her majboori and the biggest limitation to finding true love and happiness in her life. she is not happy and wants to get out of this marraige. plus he has also ill-treated her alot. plus what happened during that night has done nothing but limited her leaving this house even more. thats why he is not even bothered abt asking bani how she felt abt that night. coz he thinks that (as per what pia said) bani actually wants to get out of this marraige. and so he wants to help her do so.
remember in the 22 episode he said that "bani deserves to marry someone SHE LOVES" since he thinks that she is the one feeling trapped in this marraige and feeling trapped abt that night (he did not say that bani deserves to marry someone WHO LOVES HER....coz that wud mean that he is feeling trapped....which is not true coz he enjoyed that night and is happy being married to her since he has started loving her)
that is why he is feeling guilty abt that night coz he thinks that as it is bani is unhappy in this marraige, and on top of that the way he behaved that night was not right coz he took advantage of her coz of his desires.
(2) Secondly, the park road secret. he knows that bani is connected to his past in this way and he doesn't want her to get to knwo abt it and get hurt....coz he knows that once she knows abt it she would be really unhappy and would not want to remember or be upset of any sort of relationship she had with him.
This is my take on it guys.......have been thinking abt it all night....cudnt even sleep well....................just wanted to share it with u guys as soon as i woke up.