When he received the call it seemed he knew Arti from long time and sensed that she has concerns
wanted to find out what she wanted from him why she called him. he knows and wants to keep distance but at same time he has realized she needs someone to talk to to and is same boat with same apprehensions as he has.
Yash has few scenes in the show on a given day but are so meaning ful and in depth. That compensates for all extra dialogue props and interactions that characters have in a scene