Attachment theory basics
Attachment theory, developed by John Bowlby and later extended by Mary Ainsworth, describes the patterns of relating to close others that develop in early childhood and persist into adult relationships. The core insight is that the way our caregivers responded to our needs as children shapes our nervous system's baseline expectations of what relationships feel like — whether closeness feels safe, whether distance feels threatening, whether depending on someone feels possible.
The four main attachment styles in adults:
- Secure: Comfortable with intimacy and interdependence; can manage distance without anxiety; trusts that partners will be there
- Anxious (also called preoccupied): Seeks closeness and reassurance; hypervigilant to signs of rejection or abandonment; often experiences relationships as threatening because of what could go wrong
- Avoidant (also called dismissive): Values independence; finds closeness and emotional demands uncomfortable; tends to withdraw when relationships feel intense
- Disorganised (also called fearful-avoidant): Wants closeness but also fears it; can oscillate between anxious and avoidant responses; often associated with more chaotic early attachment experiences
These are styles, not fixed types — most people aren't 100% one thing, and styles can shift over time and vary across relationships. But they describe meaningful patterns, and they're particularly visible in high-stakes relational contexts. Non-monogamy tends to be one of those.
Secure attachment in CNM
Securely attached people generally navigate CNM more easily than anxiously or avoidantly attached people — not because CNM is effortless for them, but because the underlying relational capacities it requires (tolerating uncertainty, trusting partners, communicating needs, managing difficult emotions without catastrophising) are already more available.
A securely attached person whose partner has a new connection can feel some jealousy without it becoming a crisis. They can ask for what they need without assuming the request will be rejected. They can sit with ambiguity without immediate need to resolve it.
This doesn't mean CNM is only for securely attached people — but it does mean that working toward greater security (in therapy, through consistent relational experience, through deliberate practice) makes CNM significantly more navigable.
Anxious attachment in CNM
Anxious attachment and non-monogamy are a challenging combination — not an impossible one, but one that requires significant work and self-awareness.
The core feature of anxious attachment is hypervigilance to relational threat: the nervous system is constantly scanning for signs that a partner is withdrawing, less interested, or about to leave. Non-monogamy provides a great deal of material for this vigilance. A partner who is on a date with someone else, who seems happy with a new connection, whose attention is divided — all of these are things the anxious attachment system may read as evidence of the feared abandonment.
Common patterns for anxiously attached people in CNM:
- Reassurance-seeking that becomes exhausting for partners
- NRE in partners being experienced as a direct threat rather than as something good for the partner
- Difficulty with periods of partner unavailability (they're on a date, they're with another partner)
- Agreements made in calm that feel impossible to hold to when they're actually happening
- Jealousy that's disproportionate to the actual situation
This isn't a reason not to do CNM if that's genuinely what you want. But it does mean that individual therapy focused on attachment, building internal resources for self-soothing, and moving slowly with new CNM situations are important rather than optional.
Avoidant attachment in CNM
Avoidant attachment is sometimes incorrectly assumed to be well-suited to CNM — the reasoning being that avoidants value independence and CNM provides it. The reality is more complicated.
Avoidantly attached people are comfortable with distance, but the relational work of CNM — multiple sets of feelings to manage, more communication required, more explicit conversations about needs and agreements — can be overwhelming rather than freeing. CNM doesn't reduce intimacy; it multiplies the contexts in which intimacy is required.
Common patterns for avoidantly attached people in CNM:
- Using non-monogamy to avoid deeper intimacy with any single person
- Partners feeling chronically unimportant or deprioritised
- Withdrawing from conflict or difficult conversations when they arise
- NRE wearing off as emotional intimacy becomes expected and the next new connection becoming more appealing
- Difficulty understanding why partners need reassurance or more connection
For avoidantly attached CNM people, the work is usually less about tolerating jealousy and more about developing capacity for sustained emotional presence — with multiple partners, across the repeated difficult conversations that CNM requires.
Disorganised attachment in CNM
Disorganised (fearful-avoidant) attachment involves wanting closeness and simultaneously fearing it — which can produce oscillating patterns that are confusing for both the person experiencing them and for partners. In CNM, this can manifest as intense connection followed by emotional withdrawal, pulling partners close and then pushing them away, or seeking reassurance and then rejecting it when it's offered.
Disorganised attachment is often associated with more significant early relational trauma, and tends to benefit from individual therapy specifically oriented toward processing those experiences. Of the four styles, it's the one where professional support is most clearly important rather than merely useful.
Polysecure: the CNM extension
Jessica Fern's 2020 book Polysecure extended attachment theory specifically into CNM contexts and became widely read in polyamorous communities. Its central contribution is arguing that security in CNM relationships isn't just about individual attachment style or dyadic (pair) relationship quality — it's about developing what she calls "secure self," the capacity to be your own secure base.
Fern's framework describes what securely functioning CNM relationships look like in practice — not just the absence of anxious or avoidant patterns, but positive features: partners who are reliably present and responsive, repair after rupture, genuine care for each other's wellbeing within a non-hierarchical context. She extends the acronym HEART (Here and present, Expressed delight, Attunement, Rituals and routines, Turning towards in conflict) as a framework for what each CNM relationship needs to feel secure.
The book is widely cited in CNM communities as one of the most practically useful frameworks available. It's not a quick read, but for people doing serious CNM relationship work — particularly those who recognise anxious or avoidant patterns — it's worth the investment.
Working with your attachment style
A few things that tend to help, regardless of style:
Know your patterns. Understanding what your nervous system does under relational stress — what triggers anxiety, what prompts withdrawal — means you can name it when it's happening rather than acting from it automatically.
Communicate about it. Partners benefit from knowing what you experience and what you need, rather than having to infer it from behaviour. "When you're on a date and I don't hear from you, my brain starts to catastrophise — a quick check-in text helps a lot" is more useful than silence followed by an anxious outburst later.
Build your own resources. Secure functioning isn't just about what partners provide — it's about having internal capacity that doesn't depend entirely on reassurance from outside. Therapy, meditation, reliable friendships, physical exercise, having absorbing activities — all of these contribute to a nervous system that can handle the uncertainty CNM involves.
Move at the pace of the less comfortable person. In CNM relationships where partners have different attachment styles, pacing to the person who needs more time and support is usually the right call — not because the other person's needs don't matter, but because rushing into situations that trigger acute distress doesn't build tolerance; it just produces crises.
Attachment styles are not fixed. "Earned security" is a real phenomenon — people who were anxiously or avoidantly attached develop more secure functioning through consistently responsive relationships and (often) through therapeutic work. The style you have now is not the style you're stuck with.
Related: Jealousy in open relationships · What is NRE? · What is compersion? · Non-monogamy for beginners