[Dallol]

I do not think Krish is thinking or planning to have an affair with Meithrei or Parvathi, now or later.

In the penultimate episode, Krish, - while talking to himself - hinted that he feels satisfaction in getting back at Desai in this way by having sexual intercourse with the women who had an affair with Desai in the past. 
More so, there could be a sexual romp with Nidhi as it is known that she had sex with Desai and is now for Krish to conquer.

On the other hand, Krish should quickly shed this lethargy and rigidity as he must now realize (after overhearing the conversation between Meera and Desai) that his relationship, perhaps his marriage too, is hanging on a thin rope that can snap anytime.

He must realize (that continuing like this!) will lead to a final break between him and Meera...

What Meera and Desai have is not just occasional sex, it is now an obsession - even though she keeps assuring him that she loves him more than anything and that with Desai it is just sex and she is not thinking of separation because she cannot imagine a future without him (Krish) -.etc. etc. 

He should talk about her obsession, about her inability to stay away from Desai's cock. 
He needs to talk to her about it without attacking her directly, but he needs to point out his annoyance at it. 
He has to act soberly and rationally and come up with a new strategy to end the whole thing and banish Desai from his house and bed. 

He needs to take the initiative to make things right.

And quickly...

Otherwise it's over for good.


In this sense
All the best

Lollobionda