In my answer here, to this question : Does hypnosis in any form for any type of disorder work?
It brought up the valid question of why people quit therapy. Obviously, if the therapy is not helpful, it is could be construed as a straightforward cause and effect.
People stop therapy or positive coping techniques for a vast number of reasons.
What are the the key predictive factors that cause people to succeed or fail a longer term therapy which has been giving shorter term successes for that individual?