Sex addiction... Please help me with somebody?

I think my cousin is addicted to sex. He always talks about his experiences with girls and has all these naked pictures of girls on his wall. He cheats on his girlfriends with different girls with sex and if his g.f doesnt want to give herself away he dumps her harshly. From what it seems he cant go a day without sex. What scared me is that the other day he was hitting on me touching me and tried luring me into bed. Can sex addiction cause that? Im his cousin! I think somethings wrong with him ): hes 15