Heya..
I think Pritvhi is really, really, really sweet..I love him for thsat but i hate him for murder he commited, but there is no "wrong" against Kripa sleeping with Pritvhi because, Kripa is his wife and if she does and if she has decided to take this step then she should, she is not being "bewaffa" to Angad/Zaib, if she says "I still love u Angad" hat diesn't mean, I love you so that means i can't be a loyal wife does it. Angad and Kripa aren't married, so Kripa should(even though i would hate her if she did) sleep with Pritvhi.
Luv ya..
Ouma