How do you coup with your best friend?

how do deal with your best friend having a girl friend. ight well my best friend since 7 grade and we've done everything together like stay up hella late playing xbox,go to school,have the same classes,hang at the mall and stuff. I guess you can say im jealous. but i just cant help him having a B**** a** Hoe. he left me and my clan when we had a clan battle. that's hella F'D up. but is their any couping techniques to not think about them. Cuz i dont think about girls right now to drag me down.Because i wanna go to west point and join the US Army! but its gotten to the point of where it bugs the hell out of me. so yeah ,Matt