He that is jealous is not in love. 
“Jealousy is cruel as the grave: the coals thereof are coals of fire, which hath a most vehement flame.” Song of Solomon 8:6b (KJV)
The word “jealousy” comes from the root word for “zeal” and means to burn with an intense fire. There are actually two forms: a legitimate jealousy based upon love, and an illegitimate jealousy based upon envy. Legitimate jealousy sparks when someone you love, who belongs to you, turns his or her heart away and replaces you with someone else. The Bible describes God as having this kind of righteous jealousy for His people.
The illegitimate kind of jealousy is rooted in selfishness. It’s to be jealous of someone or “moved with envy.” When you were married, you were given the role of becoming your spouse’s biggest cheerleader. Both of you became one and were to share in the enjoyment of the other. But if selfishness enters the picture, any good thing happening to only one of you can be a catalyst for envy rather than congratulations. Love is not jealous of the other’s success but is the first to celebrate it. 
There is no greater glory than love, nor any greater punishment than jealousy. 
. Saint Augustine
. Kendrick, The Love Dare Day By Day
. Lope de Vega