Jai would have been very hurt by Bani's rebellious and so-called insensitive behaviour if he had been in love with Bani or if he had still trusted Bani...but his trust in Bani broke the moment he saw Bani as his bride instead of Pia...he started hating Bani from that very moment and he simply couldn't care what happens to her!
Do you guys really think that if Bani has chosen to support Jai instead of Pia and Pushkar, Jai's attitude towards Bani would have been any different? No, atleast I don't think so! Jai is most pained, hurt, angry and betrayed by the fact that he had to marry Bani and not so much by the fact that Pia left him.....
If Bani would have supported or sided with her husband instead of Pia and Pushkar, Jai wouldn't have been one bit moved by her, he would have just quickly finished off the job of destroying Pushkar and Pia and then divorced Bani...he is frustrated because Bani came in his way and not because Bani did not support him...
This is my personal view, atleast!
Cheers,
MT