Can ADHD cause infidelity or boundary issues? 

ADHD does not cause infidelity, but untreated symptoms such as impulsivity, emotional dysregulation, and rejection sensitivity can make it harder to maintain consistent boundaries in relationships. According to NICE guidance (NG87, 2024), ADHD affects emotional regulation and self-control, both of which can influence decision-making under stress. With treatment and communication, however, people with ADHD can develop strong relational stability and trust. 

Understanding ADHD, impulsivity, and emotional boundaries 

Research published in Frontiers in Psychiatry (2024) and the Journal of Attention Disorders (2025) shows that ADHD traits such as impulsivity, novelty-seeking, and reward sensitivity may contribute to boundary difficulties when emotions are high or regulation is low. These reactions are driven by dopamine-related reward pathways, not a desire to harm or betray. Emotional dysregulation and rejection sensitivity can also lead to over-seeking reassurance or misreading social cues, especially under relationship stress. 

Experts from the Royal College of Psychiatrists (RCPsych) highlight that impulsivity and poor emotional regulation are treatable through structured therapy and coaching. Psychological support such as CBT and DBT helps individuals manage urges, strengthen self-awareness, and build empathy in relationships. The NHS also recommends open communication about ADHD challenges to prevent misunderstandings and promote shared responsibility. 

For those seeking professional assessment and treatment, services such as ADHD Certify offer structured evaluations and ongoing medication reviews consistent with NICE standards, helping adults manage impulsivity and emotional control more effectively. 

Key takeaway 

ADHD does not determine fidelity or boundaries, but untreated symptoms can heighten emotional impulsivity. Through therapy, medication, and open communication, adults with ADHD can build stronger self-regulation and trust, turning vulnerability into mutual understanding and relational growth. 

Avery Lombardi, MSc

Author

Avery Lombardi is a clinical psychologist with a Master’s in Clinical Psychology and a Bachelor’s in Psychology. She has professional experience in psychological assessment, evidence-based therapy, and research, working with both child and adult populations. Avery has provided clinical services in hospital, educational, and community settings, delivering interventions such as CBT, DBT, and tailored treatment plans for conditions including anxiety, depression, and developmental disorders. She has also contributed to research on self-stigma, self-esteem, and medication adherence in psychotic patients, and has created educational content on ADHD, treatment options, and daily coping strategies.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.