I really get your point
Purvi is feeling sakshi is hell of a selfless lady....who is not only giving her house to stay but all respect and rights...which is something very imp for purvi(as she always demanded respect earlier)
Purvi is staying here..and also knowingly(believe me)..she knows that by staying her self respect is decreasing but her love for mukhi and kids has overpowered her.
She feels...staying here is better..as she can see her kids and husband and take care of them.
Kuch paane ke liye kuch khona jaruri hai..holds here for purvi..she is losing her self respect but only to gain satisfaction of atleast seeing her family.
In all this mess..1 person who has the power to corrwct is viru...the early he reacts to this mess....accepts his feelings and stays sttong...the early we get back to normal.
Every married woman..will sacrifice and does sacrifice herself everyday...for her family...thia is wht purvi is doing here...at the same time kewping hwr values intact by saying mukhi to not decieve sakshi further and not meet in isolation