I suggest you watch from the beginning as to what "PIA" is really like and then you can judge for yourself if she deserves to be with Jai.
In my opinion and I watch from the beginning, Pia is a selfish, love-her-self, money hungry and self-centered person. She cares for no one only herself. She really do not like Jai, the mere thought of her not getting something or someone is a challenge for her. Even if she gets Jai now, she will soon get bored of him and leave as soon as someone else comes along. She is only thinking of herself and how lavishly she can live. Bani loves Jai just for himself, even if he does not have anything, she will still love him. Pia is jealous of Bani
So it's not too late to watch from the beginning and then decide if she really deserves Jai. After that then you are entitled to your opinion.