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Other names for "green-eyed monster" : "envy" and/or "jealousy" The green eyed monster is just a way of saying jealousy of most of the time, a rival.
Jealousy is like a green eyed monster.
"The green monster of jealousy gnawed at her heart."
I believe you are thinking of green-eyed monster, which is a symbol for jealousy.
jealousy
A green-eyed monster is a common symbol of jealousy. It is often depicted as a creature with green eyes to represent envy or jealousy.
Jealousy.
The green eyed monster.
Oh beware, my lord, of jealousy It is the green-eyed monster which doth mock The meat it feeds on
The best idiom for jealousy is "the green-eyed monster." Saying this means that someone is jealous of something. You don't actually call the person a monster, though. You say "He was in the grips of the green-eyed monster," or "She felt the green-eyed monster taking over." It is as though jealousy is a separate thing from the person.
It is actually from Shakespeare's play Othello. It is said by Iago to Othello and describes how jealously can consume a person by personifying jealousy. It was a also the first time green eyes were associated with jealousy and gave us the famous saying "green-eyed monster".
Iago describes jealousy as a "green-eyed monster" that mocks the meat it feeds on. He considers jealousy to be a destructive and consuming emotion that can lead to harmful actions and thoughts.