Honestly speaking, Parth Vibha have been given a good amount of scenes so far. If they don't have scenes in a couple of episodes it's nothing to be upset over. It most definitely doesn't mean that they are changing the track or something. It's 3-4 days for us but in the serial world it's still the same day. How many times can Parth - Vibha meet in one day?
Secondly, their characters have an identity besides being each other's future love interests. As good as they look together I'd rather see their characters develop more.
Vibha needs to be shown interacting more with other characters even if it's Rishabh & Kamini. There is more to Anupriya's character than just being the teacher who falls for a younger guy.
As for Laksh, I see an improvement when he does scenes with Anshuman. So I'd want him to do more scenes with him so by the time complex scenes come up he's at least able to a decent job with Anupriya who is a pro.