I never said I felt 'let down', and that is not the point, as I suspect Bowden Guy knows very well.
The point is that it was a ridiculous promise. As long as we are in the EU, it was always going to be undeliverable. Cameron either knew that (in which case he was lying), or he didn't (in which case he was incompetent). Either way, it raises a big question over his fitness to continue in office.