Friend Stuff, I need help please. ugh..:/?

So I had a former friend, his names richie, me and richie both used to be unpopular (i hate the word popular) but then we joined a group in our middle school which was a very high status group. We were both really good friends till he got jealous that i was hanging out with this other friend (adham). He's the leader of the group, very chill, relaxed, and the bestest human being ever to mankind. All of a sudden adham stops talking to me, and I didnt know why. i was extremely sad. we would have 2 periods in school together, but now he never makes any contact with me whatsoever. I think its becuse of richie, but i dont know :/ What should i do, should i talk to him bout it, how would i approach him, i mean we havent talked in like 3 weeks :/ what should i do, i need some serious help, theres only 3 more days of school left and thats all i have left to talk to him. i dont want to lose him at all. hes so special to me, and to lose him would be losing the world, please help!:(