This happened to me with my ex best friend of 9 years and "friends" I had introduced them to. All of them started getting really distant and I pressed them a few times about what was going on and they kept telling me nothing but they were acting really weird. I started sending long walls to my friend telling them they can talk to me and tell me whats going on and they kept saying nothing but treated me differently. Eventually he just said he resented me and brought up a couple things from 7+ years ago and I haven't talked to him or those people again. It hurts in the moment and I was pissed when everyone else told me the same, but the best advice I can give you is move on and act for yourself. They will feel inclined to talk to you if they want to keep being apart of your life and if they don't then it was happening already. It was rough and took me nearly a year to get over the heartbreak but I wouldn't change a thing about how it went down. There's a lot more to the story but it's irrelevant. Good luck, maybe it will work itself out but just be prepared if it doesn't. Most things don't last forever.