[Blackbull89]

I don't think that would have any bearing on Nikitha. The final push for Nikita sleeping with Tarun was when she assumed Jay.slept with Sharmi that morning they reached Mumbai. This was immediately clarified by Sharmila the very next day in the hospital. But that didn't change anything for her

Also, she made that decision of sitting in Taruns car initially thinking Jay has still hopes of her, if she directly drives Jays car after coming to Bangalore. Infact Tarun is the one who asked her to go to drive Jays car citing Jay might feel.pain in his elbow while driving. So she has already moved on despite knowing Jay got into accident because he tried to stop her and Tarun at the Beach villa. After that she has been cold at Bangalore house saying she is doing it as a friend without any feelings of love for Jay. We know she loves Jay as we read her thoughts from earlier chapters 
But after the accident she only realises Jay might have loved her and she didn't realise before things spiralled out of control but no where we saw her have same feelings of love towards Jay after the accident.

Nikitha continuing things just because first time she has sex with him and told some words like assurance... That's the only reason she is continuing till date... Top of that she got some support from tharum emotionally and sexually... They discussed (nikitha and tharun ? But jay and Nikitha not discussed that's the problem..