i think its logical only that we now see tanmay as a full fledged villain...his transition or rather transformation was slow but steady...
he was introduced as a good guy , infact very good guy , respecting, obedient, forgiving , wanting to achieve n do something in life ...then we saw him accepting arushi after coming to know much but not everything about her past ...he had no house n so he lived with prof , helping them in every way possible... even enduring Komal's constant taunts ...he was already feeling bad with this constant taunts, his own failure to rise in life financially , when KN poured oil in fire ... he started thinking that he was being played by everybody , doubted arushi , thinking that prof wanted some scapegoat to accept his flawed daughter n he readily agreed to be one... then he started investigating on arushi's past n found out from komal that (there we see his first change in attitude towards chinki ) arushi had stooped so low n tried to destruct the life of her sister ...n his perception about arushi got a blow...he didn't think of asking her n clarifying ... his mind was picking up clues which he wanted to believe ...these coupled with his own feelings of failure triggered a change in him...then arushi got a better job n this also reared the animal inside him , jealousy n ego taking over...plus his pathetic doubting ...then we see him slowly torturing arushi, manipulating situations , n when adarsh came back , he started realizing that he can't go on like this n some action needs to be taken...he was happy that adarsh will go back to dubai forever n he could get a claim in the house but that never happened ...n his anger n frustration increased , n he became more bad n bad, his mind polluted with all kinds of stuff...so many things has eaten the good tanmay up n we see the result ...
but what i don;t get is where does KriYa feature in all this...why is he after them ?????????? 😡