How do I return to "no contact" with the narcissist in my life?

I am just starting to recover from being a codependent to a narcissist for 6 years. It has been slow going. I was at a really good place until they instituted their patented withdrawal and silent treatment triggering my old feelings of abandonment. I sent a text and regretted it the moment I hit the send on. "No Contact" was working. How do I get back there now after humiliating myself with that text?