I'm with you there. The thing with change is that reverting to old behaviours is actually part of the process of making behavioural change. I think that the important thing is that you assess what happened so that you can learn from it and use that knowledge and experience in planning your future attempts.
This site has helped me stay accountable numerous times. When I regain, I come back and hang out for a bit to stay on track and get in a groove. It's a tool to help us all, and I promise that nobody is taking attendance :-P
Next goal: 160.9- 50% to goal weight!