The idea of a soulmate is warm and alluring: somewhere out there, there’s that one person made just for us, with whom everything will work out easily and right, if only we meet them. Thousands of films have been made about it, millions of songs have been written, and almost everyone has at least once caught themselves wondering, “What if they’re the one?”
But behind this beautiful idea lies a surprise. Psychologists, who have spent decades studying what makes relationships happy and long-lasting, have discovered something strange: the very belief in a soulmate is often associated not with stronger, but with more fragile relationships. Not because love is an illusion, but because the mindset of “there is one destined person” quietly changes the way we treat our real partner.
In this article, we’ll explore, without esotericism or cynicism, where the idea of a “soulmate” came from, what research actually shows about believing in fate versus believing in effort, why the belief “if we fight, we’re not a couple” is harmful, and what actually predicts relationships that last. Not “whether soulmates exist or not,” but something more useful—how to love in a way that lasts.
Definition
A soulmate is a common belief about a single, pre-destined person with whom you are naturally and perfectly compatible; it’s a romantic belief, not a scientific fact or diagnosis—and it’s precisely as a belief that it impacts real-life relationships in different ways.
Where did the idea of ”half” come from?
The concept of a soulmate isn’t a modern one. Its most famous formulation comes from Plato in his dialogue “The Symposium”: through Aristophanes, he recounts a myth according to which humans were once dual beings, but the gods split them in half—and since then, each half has wandered the world in search of its lost partner. This is where all the “my other half” and “we are one” came from.
This beautiful image has become ingrained in culture, romantic films, and the public consciousness. But it’s important to remember one key point: this is a poetic metaphor about love, not a fact about the way the world works. Science has never found “meant couples,” and soulmate is certainly not a medical or psychological diagnosis. It’s a belief. And what this belief does to real relationships is something that can already be measured.
What Psychology Says: Belief in Destiny vs. Belief in Effort
This is where things get interesting. Psychologists have described two different ways of viewing relationships—and which one we prefer has a profound impact.
The first is a belief in fate (known as the “soulmate theory”): partners are either naturally compatible or they aren’t; compatibility is a given, something that can only be discovered. The second is a belief in effort (the “work-at-your-relationships theory”): intimacy isn’t found ready-made, but cultivated—through work, overcoming difficulties, and mutual adaptation.
Research shows that these mindsets lead to very different behaviors. A person focused on “destiny” approaches relationships as a diagnostic: they constantly check “is this really the one for me?”, react sharply to any discrepancy with the ideal, and tend to think in an “all or nothing” way. A person focused on “effort” approaches relationships as a cultivation process: not “is this the right partner?” but “how can we make it work?”—and therefore they are more proactive in overcoming crises. The difference isn’t in who loves more deeply, but in what they do when things get tough.
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