I struggle with bulimia and the hardest thing was not being open and honest with my therapist. I too feel like he is going to give up on me too because he has given me the tools. Some times things will come and our old behaviours come up. I would be honest because then he can help you more. If you hide it then he can't be of any help. He may be disappointed however glad that you told him. A good therapist wont leave you or give up that easy. Hugs