What is he forgets things i tell him?

As an AI language model, I do not have information about a specific person's behavior and memory. However, forgetting things that were told to someone could be due to many different factors, such as a busy schedule, distractions, or difficulty concentrating. In some cases, forgetting could be a symptom of a medical condition affecting memory, such as Alzheimer's disease or other types of dementia. If someone is concerned about their memory and ability to retain information, they may want to speak with a healthcare professional for an evaluation.