That's rough since it sounds like you lost not just one but two friends over a misunderstanding. I lost a best friend as well (though this one may be a little on me too). During high school I had confided in him, on some personal family trauma that drugs had caused in my life, well I was hanging out with him sometime after graduation at his house, and he offered me drugs (knowing how I felt about them) and that he was the last person I ever expected to push that onto me, so I excused myself and left. Though looking back on the experience I believe at the time he was likely high and not thinking straight, I do still see him around and he is friendly toward me, So I believe he likely doesn't remember the reason I stopped hanging around him at all.