I'm a guy in high school and I'm not a popular or a known person, but I am respected. But two days ago, I just found out something very surprising that shocked me 2 days ago. My friend TALKED BEHIND MY BACK, which is not cool! I also noticed that when he hangs around his friends he completely pretends that I don't exist and he also gives me a bad face when I hang around his friends. Also, when I introduce him to my friends, he completely ignores me and tries "pushing me out of the conversation." Funny thing is that he acts nice to me when he has no one to hang around. And FREAK, I have to hang around him everyday because I have classes with him. I'm pretty SHOCKED because I knew him a while back and I considered him a best friend! I always thought if I got his back, he would watch my back, but I guess not. How can I deal with this?!