Aakash guessed it is a loyalty test. Aakash has his own intentions, but whatever they are he is shown a man with a conscience. He was sad at what happened to Payal and blamed himself for not following up on Shoumik.
He didn't wanted to risk Durga's life and from Sat epi it is clear that he knows quite well to fight.
Aakash may not be killed but Durga cannot use Aakash anymore against Sakshi. They are making Durga all alone in that house so that they can finally revive Dev's character.
I hope if they have plans of reviving Dev's character they do it properly this time. Because it is long due .