What jealousy measures
It is treated as a character flaw or as proof of love. It is above all a signal, and decoding it means separating what one observes from what one concludes.
Two equally lazy readings
The first makes jealousy a proof of attachment: whoever is not jealous would not really care. The second makes it a flaw to correct, the symptom of a lack of self-confidence. Both have in common that they attribute to the person what belongs to a situation.
Neither survives observation. Very attached people almost never feel jealousy, and people who feel a great deal of it in one relationship feel none in the next.
One signal, three possible causes
Jealousy can signal a fact: something has genuinely changed, and attention is shifting. It can signal an insecurity of one's own, independent of the current relationship and often inherited from another. It can finally signal an unmet need, where what bothers is not what the other does elsewhere but what they no longer do here.
All three produce exactly the same sensation, which is the heart of the problem. No introspection allows them to be told apart by their intensity, and that is why the question of whether one is right to be jealous is badly put.
Separating fact from interpretation
The only useful operation consists in stating separately what was observed and what was inferred from it. He spent the evening with colleagues is an observation. He prefers their company to mine is a conclusion, and it calls for a check that the first does not require.
The gap between the two is almost always wider than one thinks, and it rarely closes by itself. Phrased as an observation, the remark becomes admissible; phrased as a conclusion, it calls for a defence, which interrupts the conversation.
Trust is not inattention
Granting trust is often confused with noticing nothing. These are two distinct things: one can register a change, say so, and go on extending credit. It is even the only combination workable over time.
The opposite, permanent vigilance, produces an effect documented by work on conflict: the person being watched feels obliged to justify themselves constantly, which feeds exactly the withdrawal the surveillance meant to prevent.
What is not jealousy
A feeling must be distinguished from a behaviour. Feeling worry is an ordinary experience. Monitoring another person's movements, messages or company is something else, and the law has taken it up: the French Act of 30 July 2020 created an offence of geolocating a person without their consent by a partner or former partner.
This limit deserves stating in an article describing a banal feeling, precisely because the banality of the feeling is sometimes used to justify conduct that is no longer banal at all.
Key points
Jealousy is neither proof of attachment nor a character flaw: it is a signal whose cause remains to be determined.
Three very different causes produce the same sensation, which makes introspection alone ineffective.
Trusting is not noticing nothing, and a banal feeling does not justify controlling behaviour, which the law punishes.
This article describes documented mechanisms and disagreements. It recommends no position, no party and no vote, and commits to no reading other than that of the work it cites.
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