They're nice when they need you, and kinda indifferent the rest of the time.
Sometimes you cannot. After a while, though, it'll start to smell rotten. They will want you to do the things they want to do, but never do the things you want to do. Or, they're sorry, I'm washing my hair that night or day.
If it feels like they are taking advantage of you they probably are.
listen to soursweet
If you let people take advantage of you then they are.