You Belong With Me

"Rudra how can we know a man is jealous?"Annika asked her favourite Devar.
Taking few steps ahead, Rudra smiled.
His lips parted into a cheerful boyish grin.
He spoke,"Annika Bhabhi, A man is angry when he is jealous."
Hearing this an idea popped into her mind.
What's the idea?What is Annika upto? Why did she ask Rudra the question?