Jealousy is not wrong, because jealousy can be used for personal gain. I can be jealous of my sister's achievements and it moves me to do better for myself. Of course, jealousy, like wrath, can be used incorrectly.
The attributes that God has, jealousy, wrath, vengeance, etc. are all subjective, not something God is. So every person in the OT that experiences an illness or a natural disaster, many people thought to themselves what they had personally done wrong to get God's wrath. It is a manner of subjective experience. St. Antonios (Anthony the Great) describes this somewhere as is recorded in one of the volumes of the Philokalia.
There are natural consequences of our actions. If we worship other gods, the consequences of that action is "jealousy." If we sin against our brother, the consequences of that action is "wrath." When Adam and Eve sinned, their consequences were allegorically a "punishment," although at the very same time, tunics of skin were put together. Vengeance occurs to those who fight against man, and so when man conceives of vengeance, we are reminded not to seek vengeance, but let God take care of it.
In the OT also, the people of God thought in simple terms and simple minds. As a father to your children, you have to act wrathful at times, jealous for their growth, vengeance against those who hurt them, that they may become better children, grow desirably, and feel protected. Think of God like a father who is chastising his children. This is the idea. These are equivalent to Sunday School stories where one learns about obedience, respect, morals, etc. In the New Testament, as St. Paul says, we are now receiving hard food (not the soft milk of the OT), and so we learn with maturity that we should love our enemies, learn about self-sacrifice, about responsibilities, about being gods to the world, and being Christs to the world. For once, we do not need a Shekinah glory or angels to show up and do things for us as children. We can do things ourselves because we now put on Christ. We can change this world through the grace of God. We now understand God fully, much better than the OT childish terms of jealousy, wrath, and vengeance because we "grew up."
Something from St. Augustine to contemplate on:http://www.ccel.org/ccel/schaff/npnf101.vi.I_1.IV.html