You no longer speak their language, and they don't speak your new language. Also, people outside of recovery are often very, very, very uncomfortable with truth. They can't handle the truth.
That said, it's about them, not you (even though it hurts). You now know what you need to know for the future.
When I entered recovery many of my friends turned out to be people I wanted to keep, and others turned out to be people that in the long run I'm glad I moved on from.
Cyranoak