I was talking about this, indirectly, on the ESTJ emotional outbursts thread that I started. I'll tell the story again (yay for copy and paste):
A few years ago I had a huge falling out with a friend of mine, with her being horrible to me for what appeared to be no reason whatsoever, and, because she was my coworker, I had to be near her for hours every day for over a year afterwards, with neither of us speaking to one another. That unresolved conflict drove me nuts. I even had dreams about it.
What REALLY sucked was that, out of desperation (must... solve... conflict... now!!!), I ended up apologizing, even though I still don't think I did anything wrong. It wasn't fair, really. But even though we weren't friends after that, we could at least work together. Big improvement.