Broken Friendship: Is she overreacting?

Fair warning, this one is long.

She was my best friend for 10+ years, all through middle and high school, as was her on-off boyfriend. When we all graduated, they went to different colleges while I stayed around the area and ran a business. They tried to stay together, but were quickly torn apart by her cheating on him while they were "on a break" because he was getting "too possessive" over her new best guy-friend (who she cheated on him with, by the way). During this time, she had asked me to hang out with her boyfriend more often to keep him occupied and to get him to take his mind off of the situation, so I did. I was the emotional support for both of them through the break, break-up, and post-break-up.

After the breakup, she started dating the guy she cheated with. Since her and her ex were still trying to be friends, she tried to make them get along and hang out, which was like rubbing salt in the wound. Eventually she dumped this other guy and wanted to get back together with her ex, who wisely said "hell no!" (wise because this isn't the first time she's cheated).

So around St. Patrick's day, I went over to her place to have some drinks and have a good time. All was well until that laaaast drink and she started to text him, in despair that he wouldn't respond to her. After that she got into this "Poor me" sort of thing that I found really hard to stomach for more than an hour or so. She said she was "pressured" into cheating on him, which I could understand if she had just done once, but she cheated on him FOUR times in a week, and then ended up dating the guy she cheated with. Sounds like free-will to me. And then she decided to break the news that she's pregnant, and its her ex's baby(the one she cheated on, though considering timing its really hard to say)

Now, I know she was faking it because - A: She immediately decided she was going to abort it. and B: Convenient timing, no? and C: She REFUSED to see counseling about what to do with the baby. She also lied to me about telling her ex about it, saying that he had told her to deal with it when in reality she had never talked to him.

And here's where it gets messy.

I left her house while she was whining about it. Damn it, it was St.Patrick's day and I didn't go there to hear her pity herself about what she did. I told her I was going home, but in reality I went to his party and met his new girlfriend. When some pictures were posted of me being there later, she immediately freaked out and sent me a nice little message with the first sentence being "YOU TWO-FACED *****"

Which is hardly accurate, mind you, since I never picked a side in this whole ordeal. I reminded her that they were BOTH my friends and its not fair of her to make me pick a side. Oh, and her entire family got in on calling me out on it. It was the best. (sarcasm)

Even though I know she's full of it, she claims her biggest deal is that I lied about it. And of COURSE I lied about it, she's sitting there telling me how jealous she is that I can text him whenever I want. I can't be like "Oh, hey, I'm going to your ex's party and I'm meeting the girl he replaced you with. Have fun here by yourself!"

And so ends our 10+ year friendship.

I think she's overreacting. I can understand her being upset but completely throwing away ten years? Wow.

What are your guys' thoughts?