No one is ever, under any circumstances, obligated to put someone else's wellbeing over their own. A common thing I am seeing in this thread is an unrealistic expectation of therapists; no, no one owes you their sanity. Your emotional needs are ultimately your responsibility, and no one else, even if you pay them, is obligated to take that responsibility on for you.

Therapists are trained to be able to help you with your mental and emotional challenges. Help you heal and integrate trauma. Repair your sense of self, or help you learn functional, healthy boundaries in relationships. Therapists need to be able to hold space for their clients; help them process emotions they aren't able to face on their own. Give them the room to grow and develop themselves in a way they might not have gotten before. None of these things make them superhuman nor do they obligate them to sacrifice their own wellbeing for someone else. Even a client.

It's not always possible to never cause anyone to experience distress. Less so if someone is more prone to emotional responses that entail high stress or pain. We should do as little harm as possible- not intentionally doing things that we know causes unnecessary harm-- I don't defend this therapist's decision to ghost their client. I do defend the therapist's basic human decency and right to not see someone they aren't emotionally equipped to.