In the process of doing so
Some kid I know was very friendly initially and seemed a nice kid. Then I started hearing bad things about him eg. he thinks with his dick etc and I was shocked.
Over the course of time I have found him to be manipulative, lying, arrogant,vain, selfish, parasitical, callous, self-centred,haughty and back-stabbing amongst other things.
His only goal is to gain attention through whatever means and because of this, he'll quite easily ditch you for a new random girl or a "cool" friend. He has no friends in the truest sense because his goal is to find a use for people and exploit them. If he's being 'nice' believe me it's for leverage later on when he wants something from you.
He always claims some sort of superiority over others (mostly to do with getting girls or his muscles) and lacks the ability to put himself in another person's shoes. One would say that he acts evil, while psychiatrists might diagnose him with Narcissistic Personality Disorder. As I've actually done research on this condition, I've come to the definite conclusion that this "friend" is most definitely a narcissist and I'm going to have to cut him out slowly although it's not completely possible when he goes to the same uni as myself.
He's probably one of the only people I know who if they die, I would feel nothing because they have showed nothing to me which shows they genuinely care about other people without any ulterior motive.