&gt; Should I put this on my resume? How can I respond, when he&#x27;s been lying about me and my role for years?<p>If you truly were the CTO&#x2F;Co-Founder, other people can vouch for your story and contribution.  Yes-- include that on your CV.  It&#x27;s a strong part of your portfolio.<p>As for responding, it&#x27;s not worth your time &amp; energy to react to him.  You must move on. Focus on the things you can control, helping clients, building products, and growing another business.