Victor is quite the character. he owns a very lavish house and constantly "requires" that all his friends come over to have dinner and watch the football game. while they are there, he is shameless about bragging about his latest acquisitions—his new television, his new car, and his new girlfriend (whom he brags about as if she is another one of his toys). when his friends fail to show the proper admiration for his things, he gets angry, accusing them of being jealous, and throws them out of his home. victor probably suffers from personality disorder.

Victor probably suffers from Narcissistic Personality Disorder.

This disease has an unknown cause.  However, the generating factors are usually genetic and environmental.  

The person needs to be the center of attention, there for need to show that everything he has is better. Requires constant compliments. May manifest with the behaviors that show others that one is superior, such as expensive material possessions, or an obsession with vanity and appearances.

The NPD causes problems in many areas of life, such as relationships, work, school or financial affairs

The manifestation of the disease can be characterized in two types the oblivious narcissist and the hypervigilant narcissist.

The first one is unaware of his condition, does not understand people's reaction.

The second is fully aware of his attitudes, but cannot control it.