There's misconception that friendship should last forever and that if it doesn't, someone was a "bad friend." Friendships, like romantic relationships, can run their course for lots of reasons. It doesn't mean anyones in the wrong. It means life has shifted.
Don't worry if your path seems lonely right now. You are simply removing energies that no longer match the frequency of your future. You will soon attract people who truly deserve to walk that path with you.