DO I CUT LOOSE FROM MY FRIENDS?

Hi
I'm not getting on with a lot if my friends at the moment and I just feel let down and kinda lousy about my relationship with them. I hang out with my oldest friend N who iv known since I was about 5 (I'm 25 now ) and a few guys I know through my best friend. He went to college with one if them and Iv been friends about 7/8 years with them now after being introduced but I just feel like I'm bein excluded an left out a lot now..I used to hang around with friends from school years ago before I started hanging out with these guys.
Years ago when I started hangin out with them, it would always be N callin me an saying that the guys were meeting for drinks or whatever. I always got on with 3 of the guys well but didn't with one of them. I hope I'm not being arrogant but I'm lconvinced it was always jealousy. Like I never did anythin to him an would always make an effort but he always seemed to have a problem, anytime I'd arrive he'd always have his head down an wouldn't acknowledge me for some reason, wanted a boxing match wit me at one point and lots of other things although he's nice to my face sometimes ..For years he would organize nights out an I would never get an invite despite the fact he'd text me sometimes slagging about the Knicks or whatever. That was fine N would always ring or whatever. N's moved out of town so he doesn't be out as much so i don't hear from him...I was gettin on very well with one of the guys too for a while, we were real close but I started dating so I didn't see as much of him... he always used to ring too but lately I don't hear from him at all, him and the guy I don't get on with go out on nights now without me, they'd know I'm free an just not text...I'm convinced that he's turnin everyone against me...even N was out last week with the guys and I didn't get a heads up...should I just quit hangin out with these guys or what?...like iv been on many vacations an stuff with these guys an had a blast...I'm just being left out all the time now and I'm convinced he's spreading rumour a sayin I'm backstabbing when iv done nothin...

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