no from Khanak's dialogue it seems it is the full truth and when she says thanks to him, Shaan looks up all hurt...idk anyone caught that...
and then the second one when she leaves, it seems he knows the truth but yet he is not happy with it because his wife didn't tell him...im sorry guys but i don't think Shaan suspects Khanak like that but he does want the truth...and he was searching for it and she didn't tell him so he asked Sunny...idk i feel this is truth vs. trust...and i can bet that Shaan will go after her after missing her and realizing his mistake...i just analyzed the two scenes and put them together...