I guess that's how the girl sanjana has to be treated by dev to get rid of her madness.
Sorry but I do not sympathise with such characters who go all out crazy on a married man. Even if he has issues in his marriage, that's for the 2 people in the marriage to decide what to do.
If we look at it that way, it's sona who has always gotten a short end of the stick.
Some how Elina targetted by a pyscho was ended quickly..but this sanjana track nobody is pointing it out to dev that he is encouraging ans sending wrong signals.
Either some one slap some sense into Dev
Or the pyscho sanjana.