I dont think so that nandini is acting...
coz she wont inflict the same feeling of insecurity n d pain that comes from it to manik...as she very well knows how it feels...remember she was so disturbed during d whole soha's episode...she used to get irritated...and angry so much...
And as we all know right now manik is behaving like a hulk...getting angry on so petty-petty things...so who in their right mind would try n make the hulk more angry...not his lady love..na..na...i dont think so..
also she said manik to BRING IT ON..not to herself to bring herself on...
so yeah she will face everything manik throws at her but she wont ever give himself pain again...knowing or unknowingly...
atleast she will try very hard not to...
also the reason why she smiled in my pov is coz she must hv thought that manik holded her...as she saw manik there n not pandit a/d to precap...n as soon as she saw that it was not manik her smiled vanished n she directly looked at manik 4 his reaction...i guess
n she also said to him hat she wants to bring back his smile...so she will rather not give reasons to make his returning of smile delayed by acting n all...nandini character is shown very self-righteous 4m d beginning...although she has done some impulsive things but it was always 4 manik...be it her lying or going to d farmhouse...except her verdict but that also she said coz she felt like it. ( i am not justifying it but just givin my opinion)
So she wont actually try n put a wedge between them knowingly...
lekin it will be manan's bad luck or our good luck (as i really wanted d jealousy track) or cvs interesting ways of getting ahead with d story which will result in confusion n jealousy...
(Simply my opinion...n i may be wrong also or may be she is acting to make manik come close to her)
P.S- cvs knows best lets go n ask them...he...he..he...joking guys
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