I think my crush doesn't like me?

My last cl today was the same as my crushes. When the last bell went I did the usual packing up and leaving and when I got out into the corridor I noticed my friend walking alongside my crush. I decided this was a great opportunity and went up and said hi to my friend. My crush then walked off without saying a word to me or my friend. He did this another time with one of my other friends. He's friends with pretty much all of my guy friends. My crush will talk to me in cl even though I don't sit next to him. He's never been outwardly rude to me or anything like that, I just don't get why he walks off everytime I come over. Any advice?