A nightmare

Hi my name is Alex and I am in 7th grade and I have a bully that has been bullying me for seven months. For starters the kid was my friend at first he was nice to me but eventually he became a bully towards me and I still can’t figure out why but what he does is that he makes fun of me, he insults me, he lies to me, he talks about me behind my back, and worst of it all he calls me autisic. I have ADHD not autism and when he says that to me I get super offended because when I was in kindergarten my teachers thought that I was autistic and they put me in special classes for it but it was useless for me because I didn’t have it so that’s why it offends me so much. Also he said to my face once that he would never stop bullying me also he try’s to make me think that my friends don’t like me but that’s not true. He has never done anything physical to me but he hurts me mentally every day also when I finally talked to the principal the kid was in with me and when I left he told several lies about me saying that I’m the bully but I wasn’t. Also he blackmailed me once and he is still bullying me today so all I want now is for him to stop.