Why is my crush being mean to me?

I started liking him when I was in elementary department, but now I'm in high school, I don't like him that much anymore, but since he knew that I liked him he was acting really mean to me, like for example when I was inside the classroom all of the boys where playing truth or dare, when my crush's turn he answered truth one of my classmate said who will you pick " Stephanie or Isabel? " my real name is Isabel, he answered Stephanie with a low tone of voice, he think that I didn't heard it but I did and it hurted me, and also when he dropped his notebook I picked it up he didn't even said a single word like Thank you, there are times when he smiles at me and looks at me, that's what I hate about boys, when they know that they were being crushed they get all cocky.. not most of boys though... Is there anyone who has the same situation as mine?