I got involved with some gossip, which I don't normally do. I think I was trying too hard to please the person I was talking to.
Anyway, a comment I made got back to my good friend, who is now (understandably) very angry with me. It is my fault. I made a mistake, I accept that I should never get involved in gossip and I should have kept my mouth shut. I feel awful and have learned a hard lesson.