Dont think, Adi will marry Radhika, all the truth may be revealed at the marriage, there may be lots of drama there..
Looks like this marriage track is only to clear Adi's name in police records, which is why Kavya not telling the truth and scared about..
(in a way, Adi is protecting Kavya from all the villains, because he knows, she cannot break the deal and if he does anything, they will all attack her..)
Once his name is cleared, he will turn the tables on Giriraj/Omi and surprise Kavya..
(my guess, Malini knows about the truth and already told to Adi and may be Anjali also knows..)