DD, I completely accept what you are saying but I am looking to this situation in a different way.
Dutta revealed Nakku his murkiest past when he was triggered by change in behaviour of nakku because of his out burst. Right now Nakku is prepared to reveal herself but not bold enough to speak up. She needs to be triggered and for that some circumstances are to be created. This catalytic job will be done by some other person and so the credit goes to him.
Now as you have pointed out so far Nakku's faith in Dutta and his love is tested but this is not the case with Dutta. He still has to go through it and so I feel that this will be the right way for him to qualify the test. Till now he remembers his first meeting with nakku but there he is overlooking one aspect that why was More after her and her family? Why did she ask him to save her?
If Dutta is smart to connect Kala's action with Supriya's elopement fiasco then definitely he should be able to connect his first meeting with Nakku's true face also.