He is just keeping quiet.......From the way he was behaving, it felt like that he knew who the rapist was and when Bhumi was telling him how sorry she feels for KT, he was like bursting to tell her..... " I know....I know..... The rapist is......."
BTW.... For the first time I liked Bhoomi's charactcer...... I know she is evil but by feeling sorry for KT she proved she is not that evil after all........
Also Tripti is a witch and Suvarna Jha who plays her is brilliant in playing Tripti..... I love Suvarna today but detested Tripti........