I do get your point, but well, I didn't see any big problem/anything too OOC that Nandu turned around from Manik, smiled and couldn't meet his eyes after that passionate kiss that they just shared. Some things don't change in the course of a relationship; if you are shy, it's not like suddenly you are going to become bold.
She is pretty intimate too; her way of intimacy is a little different than Manik's. It's more toned down. She was all over him during that jeena jeena sequence that we got; she willingly put her arms around him, right? Also, the car sequence where she was teasing Manik...she was rubbing his thighs/putting her arms around him...isn't that pretty intimate? I think saying that she is doing him a favor by letting him get intimate with her is a little too much..lol π
As for her running away, I mean, it was definitely a set up so that she would get kidnapped. Agree running away gets a little annoying, but it was clearly just so that Pandit can kidnap her.
The problem wasn't really Nandu's reaction IMO. It just didn't flow properly. They cut the kiss to Nyo/Pandit conversation and then back to the kiss, so I would say editing department is the one to be blamed the most.
Again, I know this is all very subjective! π