I had a brewing conflict with a therapist (not my usual one, but one I was consulting on another matter with my usual one's knowledge) and it resulted in a blow-up. I came in the next week, ready and willing to try to talk through the problem. The therapist was hugely defensive, seemingly angry, and unwilling to own any part of the problem or to admit that she had done anything wrong in any way. I left, never to return. I do not regret it.

But then, I have had other experiences with other people and other therapists when I have gone back, we wrangled, but then we came to a better place in the end. I think there is something to be said for really seriously trying to solve the problem before abruptly leaving. After all, if our relationship troubles from real life will manifest themselves in the therapy relationship, then part of the whole point of therapy is to work through them. But you've got to have a good faith partner. If the therapist isn't capable of or willing to look at themselves and to really ponder their own contribution and 'fess up to it, then I think leaving might be the only option.