Friend which is making me ANGRY

Hi, I have this friend, I get reaaally jealous of him, I don't know why, but anyway this jealousy turns into a huge amount of anger that builds up over a long period of time. Its been 3 times that i have exploded in a fit of fury and started punching him. We are still friends. I don't know what to do, it won't go away. When I think of his face I just want to punch the living daylights out of it.

I need to manage this anger somehow, or turn off the huge amounts of jealousy i get. I wish i didn't get jealous, i would just love for it to go away. I am stuck for causes as I am physically and socially dominant over him. I think I am jealous because he is developing as a person, getting in touch with his soul and who he is, and expanding and making new friends. All of which is not happening to me, I feel stuck. What should I do to stop all of these annoying feelings? Thanks for reading.