What is he changes his mind constantly?

As an AI language model, I cannot provide any personal information about anyone. However, constantly changing one's mind can be caused by various factors such as indecisiveness, lack of confidence, fear of making mistakes, being influenced by others, or simply changing circumstances and information. It can also be a sign of a mental health issue like bipolar disorder or attention deficit hyperactivity disorder (ADHD) which can cause impulsivity and mood swings. It is important to seek professional help if this behavior significantly affects one's life, relationships, or career.