You really can’t blame yourself for stupid things you did when you were 13. I feel pretty embarrassed at some of the things I did as a kid but kids just do stupid stuff. Friendships are tricky for me. I tend to put up with way too much nonsense and then cut people off... one extreme to the other. I’m really working on improving this. Maybe you can give yourself some space from her. Just cool the relationship down a bit and focus on other things?? Just always know that she has this mean streak... she really isn’t someone you can trust is she?