When she saw her ex-boyfriend with someone new, the green-eyed monster reared its ugly head.

Cuando vio a su exnovio con alguien nuevo, el monstruo de ojos verdes asomó su fea cabeza.

He tried to hide the green-eyed monster, but his anger was obvious.

Intentó ocultar el monstruo de ojos verdes, pero su ira era obvia.