Niki hasn't cleared the misunderstanding between those two and they all feel Abhi is not a good person and he tried to use their friend..Any true friend would do what Armaan did in my opinion..He has always seen Abhi forcing Niki for something..He hasn't seen anything from Niki's side..and when everyone says he didn't let Niki speak, well at the end it's Niki's decision to speak or to not speak...She used to shout all the time at Abhi without listening to him, so at least we know she knows how to get her point across, so why can't she do that with Abhi?....
I would want a friend like Armaan..If knowing some took advantage of me and my friend didn't say or do anything, then I wouldn't want those kind of friends who just watch everything from far......