Some people seek attention more than others. When they really exaggerate, we consider them to be real attention freaks. It is human nature to seek attention from others.
When you go clubbing, she/he always demand VIP treatment. Expensive drinks are part of the repertoire. They wouldn’t be caught dead among common people.
They only want their company when it suits you. They are good friends to them, they listen to your problems and help them in times of need.
They share your happiness. On the other hand, they are never there when they need them.