Is NOBODY wrong in the post ? POST : Sorry if bad grammar english is not my first lenguage. So i have a friend that is very naive but not dumb, so it is very easy to lie to her.
I am (m) 19 and my best friend has a lot of relationships and most of the time she asks for advice to my friends and i, we always say what we think is best for her but sometimes i am so sure the other dude is just using her for sex.
Ex. I would tell her that he is lieing to her but she is so obstinate that she just ignores me and when she gets hurt she just says that i was right and that she should have listen to me but she just doesn't change. 
I just dont like to see her suffer when the other dude dumps her after getting sex. 
AITA for getting mad at her? 