1) I don't think Manik has any reasons to doubt Nandini's love for him. He is well aware that Nandini would never think bad for him. He saw how she wanted a hug from him after their 24 hours separation. He also saw her pleading with the Magistrate that he has not done it. He saw her running behind the Police Jeep crying. So, what is her fault? Her fault is that she could not lie. From Manik POU, It is true that she is not aware if Manik is involved in Soha's death because she was unconscious. Manik knows that Nandini is a poor liar. He could also give her the benefit of doubt that she got scared and freaked out. She was in the company of elders who was only looking at her. It is only natural for a 17 year old to get nervous and blurt out something she was not supposed to say or what she was taught to say. Also, Nandini clarified to Manik that he told her to tell the truth and that is exactly what she said. Manik knows that Nandini takes anything what he says very seriously. Manik also knows that Nandini would definitely approach Nyonika for him. She has always stood up and spoken to Authorities (for Cabir and Navya). Manik knows how manipulative Nyonika is and he also knows that she does not approve his relationship with Nandini. After getting him out of the Police Station she even asked him, " Are you over that girl now? Seriously Manik... after what she has done today, I don't think you can have feelings for her". If Nyonika could get Khurana to withdraw the case almost immediately after he was arrested, why did she not do it before the Court Drama? Also, Manik may find the Hard Disk missing that could lead him to doubt Nyonika's equation with Khurana. So... If the Creatives decide to give Manik some brains, then he will analyze Nandini's behaviour and confront her. And if a conversation happens between them, Manik can easily know Nyonika's role in the entire drama.
2) With Cabir and Navya on Nandini's side, it is not difficult to convince Manik to hear her out. Nandini has already told Cabir that Nyonika did not defend Manik at all in front of the Press. She also told him that Nyonika told her that Manik's love for him made him a Murderer. Also remember his conversation with FAB3 that they need to get to Manik as there is something fishy happening. Also, at the court he said, "Why would Nandini do that? It doesn't make any sense!". Cabir has seen to what extent Nandini can go to protect Manik. She even sneaked into Soha's Farm house to keep him safe. So, If a talk happens between Cabir and Nandini, that could clear a lot of things. Also Navya is staying with Cabir and she may talk about Nandini to him and Cabir can confirm his doubts of 'something being fishy'. Cabir is a positive influence on Manik and he always listens to him. So Cabir can tell Manik what he knows or convince Manik to talk to Nandini.
3) Nandini has always fought for herself and for the ones she love. She stood by Cabir even when he was not friendly with her. She is stubborn and persistent. She would not give up trying easily. So she will try to talk to Manik and try to tell him why she did what she did. If that happens, there is no reason why MaNan would break up unless it is to show Nyonika that she has succeeded in her plan and then join forces to find more about Nyonika's involvement.
So... I am RIGHT or am I right? š
Having said that many things that happen in KY2 has no logic behind them. Also, It is very evident that the CV's think of us viewers as fools and without brains. So I can't still say for sure that IHU won't happen.š