This has just happened to me and I can remember it happening at least twice in the past. I have a friend that I've previously got on pretty well with but who has a few annoying characteristics, but haven't we all. We met up a few weeks ago and suddenly all of the things I found annoying seemed magnified. I thought maybe I was just having a bad day so left it a couple of weeks and then sent her a message to see how she was doing, but her reply really irritated me. Today she has sent me a message suggesting we meet up and I dont want to go. It's like a final straw moment happened last time we met and I just dont want to be friends with her anymore.
I remember a similar thing happening a couple of years ago with another friend who I thought could be a bit self absorbed but was generally a good person. Then one day she sent me a message, I can't even remember what it was about, and something switched in my brain and I just found her too self absorbed to deal with anymore and I didn't reply. We haven't spoken since.
I'm beginning to wonder if I'm too intolerant and a bad friend or has anyone else been in a similar situation?