Answer:
Theo appears to be suffering from Schizoid personality disorder
Explanation:
The schizoid personality disorder is a type of personality disorder. This disorder is characterized by emotional coldness, detachment, secretiveness and inability to form personal relationships and difficulty in expression of feelings. A person suffering from this disorder also lack interest in social relationships and are generally remain aloof, cold and indifferent. Such people simultaneously demonstrate an elaborate, rich and an exclusive internal fantasy world.
Therefore, Theo appears to be suffering from Schizoid personality disorder