Jealousy, which we talked about last time, often has a deeper fuel than it appears: the feeling that you are not enough compared to who the other person is or who they might become without you. And that brings me to something equally challenging: the personality differences between partners, those traits that fascinated you at the beginning and that, over time, end up driving you mad.

It is not a coincidence. It is a well-documented psychological mechanism.

There is a real tendency, confirmed by research, for people to be attracted to those who have traits that complement their own. The introvert is fascinated by the extravert's energy and openness. The orderly person is drawn to the spontaneous and unpredictable one. The analytical thinker is captivated by the emotional and intuitive one. At first, these differences seem like exactly what you were missing. They complete something. They add a dimension you do not have yourself.

The problem arises after the idealisation phase passes. The very same traits that attracted you become sources of friction. His spontaneity becomes irresponsibility in your eyes. Her emotional nature becomes exaggeration. Your orderliness becomes rigidity to him. And you end up wondering how you could have chosen precisely this person.

The answer is that you chose them precisely because they are different. And difference, when not understood, becomes conflict. When understood, it becomes growth.

Carl Jung spoke of the shadow, that part of our personality we do not acknowledge or reject in ourselves. One of the mechanisms through which the shadow influences our relationships is precisely this: we are drawn to people who freely express what we have repressed in ourselves. And then, living closely with them, we are disturbed by the very freedom we never allowed ourselves.

That does not mean every difference is a disguised lesson. There are real incompatibilities that personal growth does not resolve. But a large part of what we call incompatibility is in fact discomfort with something we have not yet integrated in ourselves.

What does this look like concretely in a relationship? An example I encounter often: an extroverted partner who needs frequent social stimulation and an introverted partner who recharges in solitude and quiet. The classic conflict is that one feels the other is isolating them, while the other feels the first is exhausting them. Neither is wrong. They simply have nervous systems with different needs.

The solution is not for one to become the other. It is to understand the mechanism and negotiate a rhythm that respects both needs. The introvert can make the effort to be socially present in certain contexts. The extravert can respect the need for withdrawal without interpreting it as rejection. But that first requires understanding how the other person functions, not judging them through your own lens.

Personality differences also have a direct effect on sexual life that is rarely discussed. People with different attachment styles, one more anxious and one more avoidant, for example, will experience physical intimacy in fundamentally different ways. The anxious person seeks physical closeness as a source of reassurance and confirmation. The avoidant person may experience that same closeness as pressure and withdraws precisely when the other needs contact most. Without understanding the mechanism, each interprets the other's behaviour as indifference or lack of love. And both suffer needlessly.

What does a partner who is different from you actually offer? They offer you territory in which you can grow precisely in the directions where you are less developed. If you are someone who controls everything and plans excessively, a partner who is more relaxed about the unpredictable can teach you something real about what it is like to let things unfold. If you are someone who avoids conflict at any cost, a partner who is more direct and willing to call things by their name can push you to develop a voice of your own.

Growth in a relationship does not come from comfort. It comes from friction with someone who is different enough to pull you out of your comfort zone and present enough to stay beside you while you move through it.

I believe the most valuable relationships are not those without differences, but those in which differences are approached with curiosity rather than resentment.

What is the trait in your partner that irritates you most repeatedly? And if you looked at it without judgement, what do you think it is telling you about yourself?