Friends excluding me or purposely making me jealous?

Hey guys I am a 20 year old male college student and I have been having some trouble lately with what I would call my "best friends". Two of my friends who I introduced together last year are always hanging out without me. My one friend, Mike was one of the first people I met here at school and then we kinda had a falling out last year but we forgave each other last spring and started hanging out again. My other friend, Jordan I met while me and Mike were taking time apart and hung out a lot last year, then we decided to room together this year (dorms). The year started off good with all of us hanging out together but progressively Mike would start to contact Jordan more and more until eventually he was the only one he'd text/call anymore. They began hanging out without me every once in a while and that also progressed to the only time I would hang out with them would be if I was around when Mike contacted Jordan or if I tried contacting one of them when they were already hanging out together. Jordan (my roommate) spends all his time at Mike's dorm and even sleeps there more on Mike's futon than in his own bed. I KNOW WEIRD. Anyways I have tried talking to both of them separately about it but they both just act like nothing is going on and nothing changes. I'm confused, how do I handle this situation? I've tried acting like it doesn't bother me, but it does. I feel like I'm not good enough for them. Please help???