Maybe he somehow found out that Arnav and Sheetal were dating in college, and he sent Sheetal to RM to ruin the lives of Arnav and Khushi!
Sheetal is doing all this drama because Shyam asked her to...so Aarav is not Arnav's son!
It is all a plan by the sinister Shyam to ruin the lives of our Arshi!
This is just my opinion! Please no bashing! Only healthy discussion!