If you still have the email, you have evidence that could be used to file a complaint - if you want to. It was not ethical for him to suggest that your therapeutic relationship should be terminated so that you could begin a friendship. That's ethics 101.

I'm not sure if I understand the situation any more than I did previously, though. I feel like I'm missing something. Why would the pdoc talk to the managers so that you would be terminated? What was the reason given for the termination? You don't have to answer any of that, I was just wondering. Regardless, the ex therapist was wrong to say you should stop therapy and work on a friendship.