[ComfortEagle]

Here's my theory. And so far, I've found it to be true. Girls hate other girls. No matter what they say, they are always jealous of each other. So, if you start dating your GF and her best friend starts hating you, it is more than likely a mental thing with her best friend. Whether they know it or not, your gf's best friend is actually jealous of her, therefore, she takes out all aggression, not towards your gf, but you. As I have learned from experience, once you break up with her, that best friend that hated you, will not have a problem with you. That is what led me to this theory.