Not an AIBU...
But, I was sometimes bullied in my secondary school (girls school) and left after someone (who actually didn't bully me) set fire to my hair and I then left immediately after that and went to another school for 3 years. The actual bullying funnily enough was more girls falling out, not relentless every day stuff, we soon made up. But it was known as a rough school and other girls were regularly attacked, even with boys from other schools, the teacher and the headteacher did nothing or very little.
So this is all in the past, a school friend of mine from there, we still chat as she's on FB and she said 'have you seen X schools FB page?'. I'd viewed it once before but wasn't that interested. Then she said 'Susan X is on there, the one that set fire to your hair.' I had no idea she was on there, she seems to be doing ok from when I took a brief look and she looks moreorless the same as she did when we were at school. But my reason for adding this post is I'm almost tempted to send her a message and say 'do you know you were the reason I ended up leaving that school?' I get the feeling she'd deny this. So what would you do? Message her or just leave it.