I had a good friend in college who I hadn't thought about in a long time. I recently realized that, in my memory, one day she was there and the next day she wasn't. Several months ago, I located her and sent her a note hoping to get back in touch, but, of course, she didn't respond back. It was a bad time for me with lots of memory gaps when she "suddenly" disappeared, and I KNOW I did something to precipitate her leaving, but I have no idea what. I kept an extensive journal at the time and I know I could look it up if I really wanted to know, but I decided to leave it alone. If it hurt bad enough for my mind to forget, I don't want to remember and relive it.