Love story tho love story hai and it was and is not sudden... Shyam and Anjali were the other two pillar's ..
But it was always Anjali-Arnav and Shyam-Khushi...They never had a couple moments right?
But you are right, it is his job to make us like them as couple. Problem is Anjali and Shyam in their current state are just not likeable.
This would have even worked 3 months ago, not now from the audience pov.