New kid at school, very jealous i need your help?

ok so this new kid came this year to my school and ive been friends with all my friends there for almost 3 yrs now and hes just met them but he acts like he knows them better, i always show him up, and he has this major crush on one of my good frineds, he also trys to make a fool of me in front of my friends (most of them girls i know almost all the girls in my grade) and recently hes been agressive of me sitting with my friend jess in religious studies like he'd move my stuff so he could sit with her and then when i sit back there he gets really angry and thinks hes better.. hes walking all over me.. please help.. reccently ive fought back and tryed to kick him from group and hes also making really bad comments bout my friend caitlin who invited him to be in our group as he had no friends... any ideas any advice please help??