Originally posted by: abca19510
1. She does love him.
2. Although, right now it is shown that Katha is doing this for sake of Aarav but, seeing the track record of this show, that can change very quickly in few episodes or make the previous reasoning more reasonable which many might find unacceptable. Writers can completely change her reasoning behind her running away.
One of the reasons I think of is that she is running away from her past. But, She doesn't want to run away as it is not her characteristics but, her son is unable to cope with the past and that past is increasing the gap between her and Aarav. For some reason, she thinks that it is best for Aarav. Writers might present this as a flaw in her character as there is clear reversal of role between Katha and Viaan. However, viewers are used to having an absolute perfectionist Female Lead so, it is unlikely that something like that might happen.
3. To stretch the show and nothing else. She could have atleast informed the Viaan. But, somewhere, I think its good that she didn't. Atleast Viaan is still optimistic without knowing about her. Knowing that Katha is moving on while he is in jail, it will be more painful I guess.