Purvi- For her "people's trust on her" and "keeping up Impression" is the MOST important thing.
When Arjun was talking to her about how important she meant to him and about his love to her - she was only bothered about what Archana and others will think about her when the truth comes out.
Archana - Useless!
She doesnt know to present facts tactfully and in the right manner.
For eg: in yesterdys precap for todays episode she tells that she knows about Purvi - arjun affair. What she should have told was "Oh GOD! I just got to know something - Arjun & Purvi are indeed going around" -I just got to know about this now and that to in a coincidence...
This is soo bugging... now Manav will go by Punni's words and think Archana knew about Arjun-Purvi affair long time back and was silent about it!!