He is always jealous when you talk to other people.

He is always jealous when he sees his friends succeed.

He always envies when he sees others succeed.

He is jealous when he sees the girl smiling at someone else.

She made a scene out of jealousy with her ex-boyfriend's new girlfriend.

I read a book about Engels.

He envies you because you are more successful than him.

She was bursting with jealousy when she saw that guy smiling at someone else.

Copenhagen is the capital and largest city of Denmark.