Very relevant post and pat on the back to you for bringing this up
.. I thought that Ashu guessed Nidhi's real feelings for him and hence to keep her away for the same reasons you cited he threw her out, thereby killing two birds with one stone.. one, getting her out his sight and two, making her feel anger and hate for him and killing any love she might have had for him.
But after yesterday's epi we know that Ashu thinks Nidhi is just infatuated with him. Given that his drastic step of dismissing her and therefore ruining her career makes even less sense.. I mean on the one hand he says he's protecting her from a lifetime of pain that could come from being with him and on the other hand he inflicts pain on her by destroying her future as a doctor.. Very inconsistent...! Besides if he thought she was just infatuated, there would be no real reason to dismiss her, she would have gotten over it eventually on her own, met someone else more suited to her, or simply just moved on with a newer infatuation! Isn't that how adolescent crushes work? They never last..
Then why oh why did he do what he did? Just because Mallika said so?.. yes, he knows he's wrong to love her, but he could have kept her around or placed her in another hospital (he obviously has a network if he appears at every interview panel) where she wouldn't be seeing him all the time. If he feels its just adulation on her part and not love, his actions make no sense at all!!! He could have controlled his own feelings with her around the hospital as well..like he's doing now without her (though it would have been more challenging)..Instead he chose to cause her pain by effectively putting a blemish on her CV.
About the fact he presumes he knows Nidhi's feelings.. well, I guess comes from his age.. He probably feels since Nidhi is too young and immature the onus of thinking rationally in the relationship lies with him. The umr ka faasla can never be bridged and with it comes a host of other issues like compatibility etc etc( all the points that Anji raised). They have hardly anything in common apart from their profession and their taste for adrak wali chai! I think deep down he has this fear that if he allows this relationship to grow and then she loses interest in him, because of their different natures, then he wouldn't be able to bear it.. I think somewhere he's protecting himself as well her.. he's built a shell around himself because he knows love too much causes pain (as it happened with his baba) and now that she has broken down his defences and gotten into his heart, he feels that a breakdown of this relationship would shatter him totally. They only have had a few moments together and just those memories keep cropping up and agonizing him. Imagine if they had built many many more memories, intimate ones, then the agony would be unbearable!!
I'm just trying to get into Ashu's head and understand where he's coming from... trying to make some coherent sense of his doings!! That said, I still loveee Doc A!!