From the day one we saw how much Raj loved Divya and suddenly yeh jealousy? I don't think it is love. It is simply possessiveness. He thinks Sarita is HIS wife so this jealousy happens. But it is not love.
I think Raj is kinda egoistic, possessive and selfish.
He didn't go to Mumbai in those 10 years to find Divya. And we saw Raj Div confrontation this week. From that I guess Raj was not happy to Div's decision of becoming an actress to support her family(though they didn't show backstory but I guess as Div was asking many things to Raj but Raj never asked why Div left him? That means he knows the reason).
So now the same thing is happening with Sarita. Raj thinks his ego is getting shuttered when Rohan holds Sarita's hand. He thinks Sarita is his wife he possess her. He can do anything to her. But why will other guy talk to her? Why will he touch her?
So it is just a jealousy which is originated from possessiveness.
And this is Raj's character.
I want to include one thing more. In thursday's epi when Sarita asked Raj to call Divya he took the phone dialed the number and then cut it. Have u guys noticed his facial expression? Seems it was his royal ego which stopped him from talking to Divya. So Raj is a possessive , egoistic and selfish guy in my point of view.