When I watched Keshav in yesterday's episode, this is the feeling I got. When Dev asks Keshav to help him make Radhika understand, he replies that she knows everything we cannot change her mind. And he says its getting late (as if he has something very important to do besides poking his nose in PB affairs). I think his attitude is that since Radhika does not love him, it is better she stays in the Ashram so that Dev also will not get her. The creatives could have used his character in a better way. He was shown initially as a man of integrity and strength. If he really loved Radhika, wouldn't he also be equally eager to ensure her well being?