@nutmeg..Deep down his heart Nats/Nimrit is there and still feels same emotion for her..
As you said Agam does not like Yug being so close to Nats/Nimrit..why its a husband instinct somehow and yes his heart has not given up on his feelings for her..
I think this is what will make Agam realise sooner or later without Nimrit saying anything she is his Nimrit..