General

I miss my best friend

I went on a month long trip to a different country for vacation, she barely kept in contact with me throughout the trip.
When my plane landed, I turned on my phone to find her text me
Her: Hey wyd?
Me: I just got off my plane, whats goin on
Her: Oh cool, what are your plans today and tomorrow?"
Me: Nothing that I know of, what's up?
Her: Just wondering.

I thought she was going to surprise me with something, but comes the next day nothing happens. My friend Danielle asked me to help her with her summer assignments at the library, so I do. While I'm with Danielle, best friend asks me what I'm doing, I tell her I'm with Danielle, and she doesn't reply. She proceeds to ignore me for the next 2 days without explanation.

I sent her multiple texts asking what's wrong, what is going on, etc. When she replies she tells me "it won't ever be the same" and that "she expected more from me".

Now to give some background information;
Lately I've been realizing that she has extremely high expectations out of me. Basically the same as a committed couple and more..
-She can't take criticism well. She will take ANYTHING that even [i]slightly[/i] pokes at her dignity as offensive, rude, or hurtful.
-She expects people to talk to her in a nice and polite tone constantly, or else she'll take offense to it. The tone being the same as when you first meet someone, when you're super proper and mannerly. Unfortunately, I'm not a robot with an automated voice so I don't hold this tone that often, she gets mad at me for it a lot and says I have an "attitude"
-She is passive aggressive to the max. I don't have a lot of patience for passive aggressive-ness because I'm a straight forward person. To give an example, if she buys you lunch and she says, "It's no problem! You don't owe me anything, it's my treat." she's still going to expect you to return the favor, and she will show her displeasure very clearly when you don't buy her lunch back.
-She has no consideration to other people's feelings. Everything caters to her basically.. She will ignore me for a week straight without explanation, she'll ask me to sell her my prescription anti-depressants, she will expect me to apologize first (which I always do), etc.

I have been meaning to tell her this, in hopes that she'll change a little.. lower her expectations a little, but I know that she'll just take offense to it and won't do anything about it. So I have been preparing myself to exclude her as my best friend.

Okay, back to the argument. She tells me she's mad at me for not asking her to hang out. I argue back with her and tell her my side of the story, she disregards it and just says she's butthurt and sarcastically apologizes for ignoring me, I tell her I don't think I could be her best friend anymore due to her expectations. I told her these things literally as nicely as I could. The entire time the only thing on my mind was "God, don't offend her, don't offend her. Don't get her mad, don't get her mad." I didn't bring up any of her faults, I didn't say any of the things listed above, I simply stated that I didn't think I had the capacity to cater to her expectations because I constantly felt that I was disappointing her. And as expected, she takes offense to it. She called me fake, she called me f*cked up, she brought up things I've done in the past, and overall didn't handle it as smoothly as I wanted her to. Unfriending me on facebook, unfollowing me on instagram, taking me off her list on snapchat.. Basically cutting me out of her life.
After I realize this I reach out to her, saying that I said those things not to cut things off, but to work things out. Why is my only place in her life her best friend or her enemy? I don't know. I asked her that, she said, "I'm just hurt"

And I get that, we're human beings, we have emotions and obviously your best friend essentially being like, "It's not you, it's me" is hurtful and distressing. However, she cut me out of her life and slandered me behind my back to our mutual friends, so why should I be so understanding about this?

I was extraordinarily depressed after I realized that she basically didn't want anything to do with me. I didn't go out, I didn't eat, I didn't do anything other than sleep and watch Family Guy. I cried every night wishing that we could work things out, because she truly is an awesome person when she's not being a total pain in the ass. Whenever I looked through my files on my laptop I'd see atleast one photo of her, and there was this one photo where she was sleeping over at my place and she was dressed all in my clothes and we both looked like a couple of drunkards, that really broke me down and I cried for a while afterwards.

The thing that hit me the most was that she cut me out of her life so easily, like I was disposable. She didn't want to work things out, she didn't think to herself, "Maybe I should change myself a little." After years of being best friends, after everything, she decided that the only time I've ever spoken out against her that I no longer deserve a spot in her life. Even if it was just a casual friend.

And what else was hurtful is that she's still going out everyday with friends, she's still having a good time with other people, she's not being a mess like me. So I was just like, "Wow, did cutting me out of her life not affect her as much as it affected me?" I see it on facebook, it's not like I don't occasionally stalk her on social media.

It's been about 4 weeks since we had that whole ordeal, she hasn't said anything to me. I reached out to her boyfriend a few days ago asking if she's okay and if she's doing fine and all that, he doesn't reply.

I don't know if I should keep reaching out to her, because I know she's stubborn as hell. It still stings whenever I think about her, and it pains me to be like this with her.
What would you do in this situation?

TLDR;
My best friend and I get into a fight because I didn't ask her to hang out first. I tell her I don't think I have the capacity to be her best friend due to her extreme expectations, she cuts me out of her life. I reach out to her asking if I could stay casual friends instead of being enemies, she simply says she's "hurt" and doesn't talk to me ever again. It's been 4 weeks. I have been depressed over the entire thing and don't know whether to continue reaching out to her or to just let her go.