How to identify red flags early in your cofounder relationship w/ Dr. Matthew Jones

Mar 23, 2026

Dr. Matthew Jones, clinical psychologist and co-founder coach who wrote The Cofounder Effect, explores the psychology behind founder splits. He lays out early warning signs like recurring trust erosion and negative sentiment override. Short segments cover power dynamics, three- and four-person coalition risks, attachment-driven pursue-withdraw cycles, and why deliberate repair and evolving agreements matter.

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ADVICE

Address Recurring Disagreements Immediately

Watch for repeating unresolved arguments that erode trust and create confirmation bias about your co-founder’s intentions.
Catch these early to avoid escalation into resentment and Gottman's negative sentiment override.

INSIGHT

Negative Sentiment Override Ruins Repairs

Negative sentiment override means partners interpret neutral or positive moves as negative once trust erodes.
Matthew Jones links this Gottman concept to co-founders misreading repair attempts as proof of malice.

ADVICE

Create Regular Repair Rituals

Build explicit repair and reconnection rituals because co-founder relationships lack natural repair mechanisms found in marriages.
Use metacommunication like regular 'how are we working together' check-ins and deposit into the emotional bank account.

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Your co-founder relationship is the single most important variable in your startup's success, and one of the most likely things to destroy it.

Today, Yaniv Bernstein sits down with Dr. Matthew Jones, author of ‘The Cofounder Effect’ and founder of Co-Founder Clarity, to dig into the psychology of co-founder relationships: why they break down and what the warning signs look like.

Matt brings a rare combination of clinical depth and startup-world pragmatism to the topic - an essential skillset to help you properly understand common co-founder pitfalls, and how to avoid them.

In this episode, you will:

Learn what 'negative sentiment override' is, why it's the tipping point in a deteriorating co-founder relationship, and how to catch it before it takes hold.
Discover how the co-founder relationship is structurally different from a marriage, and why that means you have to deliberately repair and reconnect with your co-founder.
Hear why power dynamics in founding teams are almost always present and are often more destructive when left unnamed.
Find out why being able to navigate conflict is more important than finding the 'right' co-founder pairing.
Understand the risks of identity fusion with your startup, and why professional distance is a feature rather than a weakness.
Learn why co-founder agreements need to evolve over time, and what a healthy renegotiation looks like.
Explore the unique dynamics of three- and four-person founding teams, including the coalition patterns that tend to emerge and why they're so destructive.

Resources mentioned in this episode:

Dr. Matthew Jones’ website, Co-Founder Clarity (his coaching practice): https://www.cofounderclarity.com
‘The Founder's Dilemmas’ by Noam Wasserman: https://www.amazon.com/Founders-Dilemmas-Anticipating-Princeton-Entrepreneurship/dp/0691158304
'Knowing This Data Will Make You A Better Fundraiser', the TSP episode with Carta's Head of Insights, Peter Walker: https://open.spotify.com/episode/7aI9NeIVZ7JqkSH2OsizBF
The Gottman Institute - the research behind 'negative sentiment override' discussed in this episode: https://www.gottman.com
Dr. Matthew Jones on LinkedIn: https://www.linkedin.com/in/dr-matthew-jones-7a832a37/

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