I think it's inevitable that therapists will break their promises because they are human, and unless they are single and their job is their life, we as clients can never expect to be more important than their own families, or their own selves to them. If they make a promise that implies something to that effect, that would require them to sacrifice their own mental health or relationships if something went awry, they are lying to themselves and a red flag should go up for both parties. I expect my therapist's priorities to be himself/his family, his church service, his work, and I know that I am just one part of his part. It gives me comfort to know that he has his priorities in line with what I think are healthy, even if it means, I'm down on the list.