Jealousy; has already been crowned as the "chief devil" of relationships. Indeed, it's an insidious poison that slowly nibbles away the trust and bond of love between partners.
Left unchecked,  a modicum of jealousy can lead to heartbreak, divorce, separation and even death (suicide or murder).

Jealousy operates by insinuating the thought that your partner is not entirely faithful to you;  and causes you to distrust and suspect your partner's every move and social interactions.
It dangles in your mind the conviction that your partner might be cheating whenever you are not with them.  It goes a step further to conjure proves about your partner's infidelity and disloyalty and then motivates you to confront/accuse your partner.
The psychological backwash of this is that you find yourself tightening your grip on your partner.
Monitoring their every move.
Trying to sensor who they talk to, interact with, associate with etc.
By so doing, you unwittingly become a pain in the ass in their social lives. Before you realise, you have become a socio-psychological burden: creating a chain reaction that will inevitably ruin your relationship.

   But there are other cases where your suspicions are right and your partner is actually cheating: brazenly playing on your intelligence, feigning innocence and outrageously denying when confronted, and getting away with it.
How then can you know the difference between when your imagination is running wild and when your partner is actually cheating on you?

Concept of trust:
First of all we should realise that once you chose to play FBI and investigate the fidelity of your partner, there can only be two outcome. 1. Dead of trust, and 2. Heartbreak.

Once you lay up accusations or insinuate that your partner is unfaithful, and it turns out that you were wrong, and they are innocent, you hurt their dignity and puncture a hole in their trust, making them abhor you for not trusting him/her.

Trust is a delicate, reciprocal phenomenon: You trust me,  i trust you, and i trust you to trust the trust we have for each other.
Confusing right?
Let me explain: if A and B trust each other.
A finds out that B is cheating, the trust A had for B is broken.
If B also finds out A cheated, B's trust for A is also broken.
But if A accuses B of cheating, and is convinced that B has cheated when B hasn't cheated. B gets insulted and hurt because A doesn't trust him and as such B doesn't also trust A again.

So should you investigate and find out that your partner was cheating, Of course you will be hurt, heartbroken and your trust dead.
But if it turned out that your imaginations was playing star wars with you and your partner was innocent of the infidelity accusations, your partner will be hurt because you don't trust him/her,  and as such he/she wont also trust you again.

I always ask my clients;  why do you want to know if your partner is cheating?
Is it so you can break up with them? So you can discipline them? Scold them, Report them to a higher authority, or Preach to them?
Is it so you can retaliate by also cheating? Or so you can harass or even kill whoever they are cheating with? ...(to be continued)