Hi, there is this guy I work with and at first he was really nice to me. He kept asking me questions about my life and whatnot. Nothing ever happened between us. Then he started dating some other girl. He has never told me about her. After he started dating this girl he was always hot and cold with me. His behavior has completely changed. He is not like this around other girls. I'm confused thinking maybe he liked me but since I never showed any interest he got upset? When I try to talk to him now he makes it look like he is in a hurry and can't talk (even though we're at work). Why did his behavior change?