Slightly inspired by the "have you ever recognised yourself on AIBU" thread.
A few years ago a friend of mine introduced me to some of her circle, just as I had done with her. We hit it off and they started to text message me independently of her, along the lines of "hey, we're in X pub, do you fancy joining us" and the friendship blossomed.
Original friend was NOT HAPPY. Despite the fact she was in the habit of meeting friends I had introduced her to indpendently of me, somehow I wasn't "allowed" to do this.
She became more and more difficult and emotionally unstable about the whole thing. Her existing friends were horrified at the nonsense she was spouting about me, she even tried to scupper things with my original friends. Thankfully everyone saw through her.
She's now kind of ostracised herself from both groups because of her silly carry on, trying to control and script the friendships. I can imagine if she'd have come on here and told "her side" I would have been branded a "Wendy" and various other nasty epithets.
I just think sometimes we should think about what happens in "real life" and consider some of these Wendy AIBUs might not be telling the whole story.