Why psychology needs a new construct, and what it could change for millions of people.

 

There’s a kind of person most of us have encountered — or perhaps been — who seems to want connection but consistently fails to sustain it. Not because they chose the wrong partner. Not because they haven’t worked on themselves. Not because of a dramatic personality disorder diagnosis. But because, across every relationship in their life — spouse, children, friends, colleagues — something is structurally, persistently missing.

 

We don’t have a word for this. And that absence is costing people more than we realize.

The Gap in the Middle

 

Psychology is good at the extremes. At one end, we have detailed clinical frameworks for personality disorders, autism spectrum conditions, and attachment pathology. These explain a great deal about why some people struggle relationally, and they come with treatment pathways.

 

At the other end, we have the vast self-help and relationship industry, which operates on a core assumption: that relationship problems are fundamentally about *fit*. Choose a better partner. Communicate more clearly. Understand your love language. Do the work.

 

But there’s a large middle ground that neither framework addresses: people who have no diagnosable condition, who want good relationships, who genuinely try — and who nonetheless show a stable pattern of relational failure that cuts across every type of bond in their life. Family. Friends. Romantic partners. Colleagues. All of them.

 

For these people, the compatibility framing is actively harmful. Because the problem isn’t who they’re with. It’s something they carry with them.

What Research Already Tells Us (In Fragments)

 

The science has been circling this territory for decades without quite landing on it.

 

Alexithymia — difficulty identifying and describing emotions — affects an estimated 8 to 15 percent of the general adult population. People with this trait consistently report lower relationship satisfaction, describe emotional disconnection, and are described by partners as unavailable — even when they genuinely care. But alexithymia only covers the emotional processing piece. It doesn’t capture whether someone shows up consistently, whether they follow through on family responsibilities, or whether they can prioritize another person’s needs when life gets hard.

 

Attachment theory gives us a rich framework for why people approach intimacy the way they do — the roots in early caregiving, the anxious-preoccupied or avoidant patterns that replay across adult life. But attachment is measured as an internal disposition, not as functional output. Two people with identical insecure attachment profiles can differ enormously in their actual ability to sustain a relationship.

 

The DSM-5 Level of Personality Functioning Scale comes closest — it rates impairment in empathy, intimacy, identity, and self-direction on a spectrum from zero to four. But it’s a clinician-administered tool, tied to personality pathology, and designed for people who already meet some threshold for clinical concern. It doesn’t apply to the subclinical millions.

 

Taken together, these frameworks cover important ground. But none of them — individually or combined — answer the practical question: *is this person, as a stable trait, capable of sustaining the reciprocal demands of a relationship?*

What We’re Missing

 

We’re missing what you might call a **Relationship Capability construct** — a dimensional, measurable variable describing the stable capacity to initiate, sustain, and reciprocally enrich interpersonal bonds across different relationship types and over time.

 

This is not a diagnosis. It is not a moral judgment. It is closer to how we think about executive function, or emotional intelligence — a capacity that varies across people, has identifiable components, can be measured, and has real consequences.

 

The components might include:

 

- Emotional reciprocity: Can you respond to another person’s distress in a way that helps them feel understood?

- Empathic accuracy: Do you notice when your actions affect others?

- Relational consistency: Do you follow through on what you commit to for the people who depend on you?

- Priority allocation: When you’re under stress, do you still make room for those closest to you?

- Repair capacity: After conflict, do you take steps to reconnect?

 

A person with significant deficits across these dimensions, persistently and across contexts, is carrying something that no amount of compatibility adjustment will fix — and that we currently have no language for.

Why Naming It Matters

 

Consider what happens when we don’t name it.

 

The partner in these relationships spends years asking: *Is it me? Is this normal? Why do I feel so alone when I’m not alone?* They absorb the problem into a compatibility narrative, cycle through adjustments, and exhaust themselves trying to elicit connection from someone who is structurally limited in offering it. They don’t leave, because the person they’re with isn’t cruel or diagnosable — just consistently, inexplicably absent in the relational sense.

 

And the person with the deficit? They often know something is wrong. They watch themselves hurt the people they love most and feel genuinely unable to bridge the gap. Without a framework that explains this — that separates *capacity* from *character*, limitation from malice — they’re left with shame, self-blame, or a vague sense of being broken in an unnamed way.

 

A well-defined construct changes this. It creates language. Language enables honest self-assessment. Honest self-assessment enables better decisions — about relationships, about support, about what kind of intimacy is actually sustainable for a given person.

A Call to Researchers

 

This gap is one that psychology is positioned to fill. The work would require:

 

A construct validation study — establishing that Relationship Capability is measurable, distinct from existing variables, and stable over time. A general-population prevalence estimate — how common is meaningful relational capability deficit among people who don’t have a diagnosis? A partner-burden study — what is the cost to the people who love someone with this limitation? And ultimately, a look at whether any interventions reduce that cost, or whether the most honest thing we can offer is a framework for adaptation.

 

This isn’t a call for a new stigma or a new diagnostic category. It’s a call for precision — for language that allows people to see their situation clearly, without shame and without false hope, and make their choices accordingly.

 

The people who need this research aren’t rare. They are in marriages that feel like one-sided transactions. They are children who grew up with a parent who was physically present and relationally absent. They are colleagues wondering why the warmest person in the room somehow never shows up when it matters.

 

They deserve better than “incompatibility.” They deserve a science that can see them.

 

*This article draws on a research framework developed in May 2026. A formal academic preprint, “Relationship Capability Deficit: Toward a New Construct for Cross-Contextual Interpersonal Impairment in Non-Clinical Adults,” is available on PsyArXiv. Researchers interested in pursuing this line of inquiry are warmly encouraged to make contact.*

 

About the Author: Amit Sarwal is an independent researcher and writer with an interest in the intersection of psychology, technology, and human relationships.