Rebuilding Trust in Relationships Through the Lens of Polyvagal Theory, Part II

mrebekahshurtleff
Jun 14
3 min read

Trust is the foundation of any close relationship, yet it can be fragile and easily shaken by betrayal or trauma. When trust breaks down, couples often find themselves stuck in patterns of fear, avoidance, or conflict. Understanding how the nervous system influences trust and connection offers a new way to approach healing. Polyvagal Theory reveals how our bodies constantly scan for safety or threat, shaping how we respond to others. This post explores how betrayal affects the nervous system and offers practical steps couples can take to rebuild trust by creating new experiences of safety.

Calm river — A Imagining a river flowing with your thoughts flowing past you.

How the Nervous System Shapes Trust and Connection

Polyvagal Theory, developed by Dr. Stephen Porges, explains how the autonomic nervous system regulates our sense of safety. It identifies three main states:

Safety: The nervous system feels calm and open, allowing connection and vulnerability.
Danger: The system detects a threat and triggers fight or flight responses.
Survival: When danger escalates, the system may shut down or freeze to protect itself.

In relationships, feeling safe activates the social engagement system, encouraging eye contact, open communication, and empathy. When the nervous system senses threat, it shifts into defensive modes that make trust and closeness difficult. This explains why couples recovering from betrayal often struggle to reconnect. Their bodies may still be stuck in survival mode, even if their minds want to heal.

How Betrayal Impacts the Body and Mind

Betrayal—whether through infidelity, dishonesty, or broken promises—creates a powerful threat to the nervous system. The body reacts as if in danger, triggering physical and emotional responses that protect against further harm but also block connection.

Common reactions include:

Heightened anxiety and hyper-vigilance: Constantly scanning for signs of danger or dishonesty.
Difficulty opening up: Vulnerability feels risky, so partners may shut down or withdraw.
Emotional numbness or shutdown: The body may freeze to avoid pain.
Physical symptoms: Increased heart rate, muscle tension, or digestive issues.

These responses are natural survival mechanisms. Understanding them helps couples realize that healing takes time. The nervous system needs repeated signals of safety before it can relax and allow trust to grow again.

Practical Tips for Couples Healing from Betrayal

Rebuilding trust requires creating new experiences that tell the nervous system it is safe. Here are some practical steps couples can take:

Create routines that build predictability: Regular habits like shared meals or check-ins provide a sense of stability.
Practice mindfulness or breathing exercises: Techniques such as deep belly breathing help calm the nervous system during moments of stress.
Use “I” statements: Express feelings without blame to reduce defensiveness and encourage open dialogue.
Set clear boundaries: Protect emotional safety by agreeing on what is acceptable and what is not.
Celebrate small progress: Acknowledge even minor steps toward trust to reinforce positive change.
Rebuilding trust in the relationship: We focus on reasons to reasons to leave, flip the narrative to looking for reasons to stay.

For example, a couple might start by setting a daily 10-minute check-in where each person shares how they feel without interruption. This small routine can gradually shift the nervous system from survival to safety.

Moving Forward with Awareness and Compassion

Trust is not a simple decision or feeling. It is the nervous system’s response after repeated experiences of safety. Couples recovering from betrayal must understand that healing is a process requiring patience and consistent effort. Focusing on accountability, open communication, and nervous system regulation helps relationships move from survival to connection.

Sometimes professional support from therapists trained in trauma and nervous system regulation can provide valuable guidance. Therapy can offer tools to recognize triggers, regulate emotions, and rebuild trust in a safe environment.

By approaching healing through the lens of Polyvagal Theory, couples gain a deeper understanding of why trust breaks down and how to rebuild it. The body’s need for safety is central. When partners create new patterns of safety together, they lay the groundwork for lasting connection.