Ok I said in another question I had a crush on this one guy since I was eight. After a heartbreak when he fell in love with my sister, I got over him. He is a playboy, every time my sister leaves hes hitting on another girl. But then there's the sweetest guy ever, a guy I don't love, who likes me. I don't know what to do, do I just be nice to him back? Or do I tell him I don't like him.