I have been a silent reader in this forum too...like you.
Anyways, totally agree with you. And, you've got particular and good logic to think from this point of view.
Jealousy track is totally not the perfect thing without the proper motion interaction between the two main lead.
So, as for now, I think it would be better if we consider it as concern or responsible feeling towards Arzoo rather then jealousy. Cause, about girls...Zaki is nothing but an unpredictable matter... And his bro knows him quite well!!