Jealousy is not entirely poisonous and destructive to relationships. It sometimes is the spice of love, The bonding element and psychological watchdog of couples.
They say, "if your partner is not jealous when someone else has your attention, it means that someone else has theirs"
Therefore it is a little bit absurd for a person in love to not feel jealous at one point or the other in a relationship. But the most important thing is not the feeling,  its how you express it, how you manipulate it to an advantage instead of letting it ruin you.

Moreso, the dynamics of jealousy; if manipulated correctly can be used to;
1. Deepen someone's love for you. 
2. Create a cycle of dependence 
3. Conjure loyalty and respect from a spouse. 
4. Initiate a breakup. Etc
The list is endless. There are so many psychological utilities of jealousy,  depending on what you intend to achieve.
Basic steps to achieve any of the above will be explained in details.

The psychology of trust:
Trust is a dynamic psychological phenomenon that can be manipulated to great effects in a relationship. I had expounded the delicateness of trust,  and how a trust built in years can be broken in a split second by infidelity and false accusations.

Now,  when you monitor/track a partner's social life way too much, you create a psychological prison for them. And they will yearn to be free.
Meaning, that if your relationship is not socially flexible, your partner will find hidden ways to satisfy his/her social lust and end up wounding him/herself in the cocoon of infidelity.

Humans are rebellious in nature.
Anything we are told not to do,  becomes instantly alluring, seductive, adventurous and exciting.
As kids, we purposefully and boisterously broke school rules just to show our superiority. The same rebellious streak still flows in adults.
The moment you install jealousy as an "inviolable rule" in your relationship,  and dare your partner to cheat and face the consequences, you unwittingly excite the repressed rebellious streak in your partner,  and he/she will want to cheat and get away with it: just to prove his/her superiority and maneuverability.

When cheating becomes a "law of the Medes and Persians",  the urge to cheat will increase a thousand fold and a partner will seek for ways to cheat,  just to be free,  just to feel good about themselves.
Because nobody wants to be in a prison, be it psychological, physical or mental.

I always admire couples who have an understanding when it comes to sex with third parties.

A husband is about to travel for a business trip. The wife hands him a condom. He gets insulted: "whats the meaning of this?" He demanded angrily.
The wife calmly replied. "my dear,  i know that you are human,  and since i will not be there with you,  i want you to play safe should in case an incontrollable *conji* takes hold of you".

Believe me,  the man is not likely to cheat. And if he ends of sleeping with another woman,  it won't be with such excitement as it would have been if the wife was paranoid, warning/threatening him not to cheat.

So the best way to neutralise the urge to cheat in a partner is not to tighten your grip on them.
Its to let them enjoy a certain level of social freedom.
Its for you to make cheating seem as a kind of weakness; A childishness to be ridiculed and pitied.

Whereas monitoring your partner's movements and social interactions will only make cheating more exciting.
Pity and understanding on the other hand will take away the excitement and who wants to break any rule without being exciting about it?

In the story above, notice how the wife manipulated her suspicions to positive effects. She made the husband feel weak and childish. And went ahead to exhibit a superior gesture of understanding.
Gestures like this obviously, always pulls down the mountain, whereas ranting and pyrrhic suspicions will only fuel the excitement of the tryst.