i think that it's about comparing the girl to a drug because she's so addictive- she's way out of his league and she's cheating on him and he knows but he can't get enough of her so he doesn't do anything. He's obsessed with her but she doesn't really care about him. She doesn't want people to know about their relationship either. I think the first bit means that she treats him like shit and he just takes it because he doesn't want to loose her because he needs her. She's his drug.
i think that it's about comparing the girl to a drug because she's so addictive- she's way out of his league and she's cheating on him and he knows but he can't get enough of her so he doesn't do anything. He's obsessed with her but she doesn't really care about him. She doesn't want people to know about their relationship either. I think the first bit means that she treats him like shit and he just takes it because he doesn't want to loose her because he needs her. She's his drug.