Yes, I too have ended a friendship because of addiction behaviors. Back in February, a close friend that I know through the engineering business world got drunk, very drunk, at an out of town conference. He said all sorts of inappropriate and beligerent things to me. Major boundary violation. And that was it. I was done. Period. No discussion.
He called me a few weeks later and said, "Well I probably owe you an apology, eh?" I said, "You don't owe me anything. Your behavior is unacceptable to me and I do not wish to continue this friendship."
Oddily enough, this same friend knew all to well the history of issues I have with AH's drinking, yet still acted surprised that I wouldn't tolerate his behavior!
I only wish I could be as strong with those boundaries with respect to my AH! And for the record, I have no regrets ending the friendship. None whatsoever.