As of now he is not shown to be controlling. He can feel threatened as humans can feel insecure. That's just normal. If shahnawaz sees mehru roaming around and smiling with rafey he most probably won't like that either.
I get your point. Just saying, this kind of insecurity does not bode well for the relationship. Mehru is certainly not the kind of woman to adjust to his insecurities. If he were to feel concerned about her safety around Shahnawaz, that's understandable though.

dumbness seems to be in their genes. 
) and then some random guys harassing mehru on the road so than mehru will sit on the front seat when he comes back for the second time