He is a narcissist. Overconfidence in oneself is a sign of narcissistic personality disorder, a mental health condition.
They desire to be admired and make excessive demands on people's time. It is conceivable for people with this illness to be unable to understand or care about the feelings of others. However, beneath their overwhelming confidence act, they actually lack self-confidence and are sensitive to criticism of any kind.
The effects of a narcissist personality disorder can be felt in a variety of spheres of life, including relationships, career, education, and financial circumstances. People with narcissistic personality disorder may generally feel dissatisfied and let down when they don't receive the precise treatment or praise they believe they are entitled to.
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