I would have felt bad for Arshi if she had not bitched about Gauri with Hina considering all the good things Gauri said to her. I think bitching about his wife just makes her seem like one of those possessive people when she has no reason to be possessive over Hiten to begin with.
Why does he have to choose Arshi over Shilpa? Why does he have to tell Arshi he didn't choose her? And why is she still upset after Hiten gave a clear reason for doing so? If she really does respect him as much as she told her father and she really believes ke uska dil accha hai then she should clarify it with him herself. Flirt karne ke liye kisika wait nahi karti toh clarify karne ke liye dusro ki salah kyun le rahi hai. Go talk to him directly.