What is trust? Kindly have a look?

I've read at places Manik should have trusted Nandini( even i agree to this, because i hated the way he made a mockery out of every beautiful things which happened between them just to alienate her)

Agreed!
No fault of nandini .

Now toh manik will have a tough time if he want her back in life.
He broke her trust and more than that he broke her belief for true love.

Manik ne toh Kar diya for friendship but he will soon realise this all is so not easy that he will forget away all this by being monster manik.

How long he will fake it!

I still want her to trust Manik...
If Manik's need is only to use her & leave he'd've used her when she was drunk, when they're locked in storeroom, when she's at his place..
Just tell me if Manik wanted to break her heart, then why he helped Rishab & let the NH3 win...
nandu is not a baby to fall for a trap she took lot time to trust him..

Ok so I just wrote my opinion on this in another post; am repeating that here.

I would say 'trust' is a two-way street. Nandini's trust for Manik didn't come in a day, nor was it unexplained in any way. It came because he had 'earned' it. Given their history, Nandini could have chosen to ignore all the little signs of goodness she had seen in him and walk away, but she did not. Willingly or unwillingly, he showed his trustworthy side to her through little incidents, and she actively chose to believe in him and overlook that 'monstrous' side that she was well-aware existed in him.

Trusting someone is always a choice you make based upon their actions. Expecting Nandini, or any other character for that matter, to be a mind-reader and get through immense pain and shock in order to read his eyes is extremely unrealistic in my opinion. Yes, unconditional trust should exist in a relationship, but that can only happen when it is supported by communication. Every time Nandini 'saw through' Manik and comforted him, she already had an inkling that he was disturbed in some way, be it when he hugged her or when he shouted at her when she told him about Cabir. This is why the responsibility for this particular fiasco rests solely on Manik for me. He simply did not communicate. Instead he deliberately hit her where it would hurt her the most. He cheapened the trust he had built himself. Nandini, in the future, might figure out his reasons. I am hoping she will. But her 'trust' should not return until Manik learns to communicate honestly.

I thnk ur rite..cannt blame nandu for nt trusting her..and yeah i wanna see ways thru vch nandu revenge back manik..bt still i dont want it to be very strong revenge ..and strong jealousy track wud doo good..i ll love it ..