My question is that what exactly constitutes as infidelity? Is it only the physical act? What about the thoughts and intentions of the people involved? I mean even though AR "appeared" to not go that far in that scene, but everything in this track screams infidelity (at least to me). Riddhima keeps thinking of Armaan, keeps getting affected by him, and can barely stop herself when she's around him. For me the most important part is the constant thinking and getting affected. Isn't that betraying Sid and her marriage? Doesn't that constitute as infidelity? And in a way aren't AR having an affair, which yes doesn't consist of a sexual part but the other components are all there. Both can't stop thinking about each other, keep getting affected by each other...are in love with each other? Armaan is, and Riddhima seems to be or wait is she confused again? Anyways these two even have secret meetings.
Say what you want and yes they may not have shown some scenes, but to me this is all EMA and infidelity.