I understated why Anu loves Prerna as he rescued her several times and when you rescue someone it says you become the protector. And protector usually loves his damsel in distress.
But I am not understanding why Bajaj likes Prerna? There is nothing interesting in her. She takes good care of Kuki, but any auntyjee type girl would do that. She is pretty and smart. Isn't he surrounded by girls like her.
Now Prerna will always support Anu. He is the reason why she is still with Bajaj in a "chhoona maat " relationship". I guess he is playing a game here. He will take the blame and later prove that Anu played victim. So that Prerna feels guilty and less her love for Anu. If this is so they should clear the doubts by self talk or something else. As it is not clear and we are not understanding anything.