Is it normal that i hate my best friend?

So, I've known my best friend for thirteen years. In that time, relationships have come and gone, we've cried on each other's shoulders and we've always been there for each other.
I've known her to be a boy-crazy girl with an interest in music.

When she turned to emo subculture, I wasn't surprised in the slightest, and I was fine with it because it's her life. But, since then, she's faked multiple panic attacks as well as a migraine. As a person who gets both of those, I think it's pretty insensitive and paints her as a sort of attention wh**e. That isn't what led me to, frankly, despise her, more so just annoyed with her.

But wait there's more. She came out as fully gay and since then has told me about her crushes on guys. I get sexuality is confusing, but don't continue to admit that you're gay right after you tell me all about your massive crush on Ryan.

She also has a crush on my girlfriend and a girl who is mean to me. As well as essentially all of my exes. She has been hanging out with my girlfriend a lot since she told me, but I have had no reason to suspect anything since. It does hurt me to see them together when I had invited my girlfriend over and she had declined to hang out with my best friend.

My best friend is also very mean towards me and constantly pokes fun at me. She purposely bought me a birthday gift she knew I'd hate, and well as a Christmas gift I would not like, as to upset me. She told this to my girlfriend while purchasing the items. She makes fun of my appearance and other things about me, and has even made a joke of my depression.

I do keep her around for some reason, but I feel like she is a friend that deserves to be let go.