The only thing that we can learn from this aweful and extremely negative serial is :
There is nothing more dreadful than the habit of doubt. Doubt is a sword that kills every relationship and hurts the persons who care for u the most. Vansh should understand that : There is a simple rule for a good relation: love and doubt have never ever been on talking terms.
Its on us to chose whom to be with-love/loved ones or doubt?
Since the character of vansh has turned quite negative - in short he is turned out to be a total phyco. He needs to adhere to the above written lines. Or at least the story writer should pay heed to these lines.