Your comment got me to doing some research on this, because I too have read where God is a jealous God.....
In searching the definition given by the KJV Dictionary, I found:
4. Indignation. God's jealousy signifies his concern for his own character and government, with a holy indignation against those who violate his laws, and offend against his majesty. Ps.79.
So, I went to Psalms 79.............
1) (A Psalm of Asaph.) O God, the heathen are come into thine inheritance; thy holy temple have they defiled; they have laid Jerusalem on heaps.
2The dead bodies of thy servants have they given
to be meat unto the fowls of the heaven, the flesh of thy saints unto the beasts of the earth.
3Their blood have they shed like water round about Jerusalem; and
there was none to bury
them.
4We are become a reproach to our neighbours, a scorn and derision to them that are round about us.
5How long, LORD? wilt thou be angry for ever? shall thy jealousy burn like fire?
6Pour out thy wrath upon the heathen that have not known thee, and upon the kingdoms that have not called upon thy name.
7For they have devoured Jacob, and laid waste his dwelling place.
8O remember not against us former iniquities: let thy tender mercies speedily prevent us: for we are brought very low.
9Help us, O God of our salvation, for the glory of thy name: and deliver us, and purge away our sins, for thy name's sake.
10Wherefore should the heathen say, Where
is their God? let him be known among the heathen in our sight
by the revenging of the blood of thy servants
which is shed.
11Let the sighing of the prisoner come before thee; according to the greatness of thy power preserve thou those that are appointed to die;
12And render unto our neighbours sevenfold into their bosom their reproach, wherewith they have reproached thee, O Lord.
13So we thy people and sheep of thy pasture will give thee thanks for ever: we will shew forth thy praise to all generations.
Not really what I thought it meant. I always thought it simply meant that He was jealous of our love, and did not want us loving other gods more than/before Him.
Anyway............you did get me to searching