My friend is FREAKING ANNOYING?

ok. i had this really good friend. we were the best. but then all of a sudden he started to act much different. making fun of me. bothering me. trying to annoy me and tries to make me jelous by hanging out with different people (then lauging at me) and today he went to far. now hes as affectionate as a punch to my ballsack. he is such a show off to. and he likes to see me suffer. also. once he got me suspended by lying and saying i did something i didnt. now im pissed off. really pissed of. i missed the good ol days when we were friends. we made jokes, we had fun, we did everything together. and now hes using all the jokes I made and calls it his own. and he now makes jokes that make the IRATE GAMER seem original. and he now talks like a russian because he thiks hes funny. hes really annoying and really childish. we are both 14 and hes acting like a 6 year old. plz help