To say, “He remembers what he WANTS to remember” is sometimes true. It doesn’t mean that the forgetful person deliberately chooses not to remember something that he actually does. This would merely be deception. But sometimes a person only remembers what his emotions “allow” him to remember. In other words, his emotions are interfering with his ability to remember something. The more of a factual and rational person you are, the less likely this will happen to you. This is because to be “factual and rational” means, psychologically, to be in the habit of distinguishing between facts and desire, at least when the two conflict. If you’re in the habit of making distinctions, in your own mind, between facts and feelings, then you’re much more likely to remember having done so–and to remember what those distinctions are.