Jealousy is the green eyed monster as we are reminded by Iago in the play.
"O, beware, my lord, of jealousy;
It is the green-ey'd monster which doth mock
The meat it feeds on."
In four hundred years since WS wrote these great lines, we don't seem to have been able to tame or conquer this monster. Jealousy is still very present with us, and rears its ugly head often in all relationships.
Jealousy obviously is a part of the human condition.
