Answer: Marty is moody, manipulative, unstable, lacks a clear of sense of identity, and often clings to others. He wants to have close relationships but is unable to do so because he is untrusting of others. Marty is suffering from borderline personality disorder.
Explanation: Marty is experiencing borderline personality disorder because he is experiencing an ongoing pattern of unstable moods and behavior which is a sign of the borderline personality disorder.