My (21F) best friend (20F) didn't invite me to her birthday. Am I in the wrong?

Anonymous

My best friend and I recently got into a big disagreement. I have known her for 2 years. We met through work and were super close. For the last couple of months she hasn’t really been hanging out with me as much. She has been hanging out with a bunch of new people she has met.

She still would talk to me at work and say Hi when we saw each other. Her birthday was coming up, she and one of her other friends got an Airbnb. They both were doing their birthday party together. She invited me and told me I better come. I was excited and told her that I would definitely be there since she's my best friend. We haven’t hung out in a while so I was happy we can finally do something together. I texted her few days before the date of her Airbnb birthday party. I texted her asking for the address of the location. She then proceeded to tell me she was not going anymore. She told me don’t even bother coming. Since she told me that I ended up not going.

Fast forward to the date of her party, I open up Instagram and I see a bunch of posts of her partying with people at the Airbnb. I was really upset but mostly hurt and sad. I wonder why would she lie to me? Did I do something wrong? I ended up texting her and telling her how I felt and that I no longer consider her my best friend. She then proceeded to reply and tell me that I am very immature and that what I'm doing is very childish. She told me I am making assumptions and jumping to conclusions. She claims she never had the intention to hurt me and that I am in the wrong. She said I am getting mad over stupid sh*t and she doesn’t care if I no longer considered her my best friend. I didn’t reply to her message I was to hurt and upset. It also turns out after the incident she has been talking crap about me at work to other coworkers saying I am childish. She called me a bunch of hurtful names as well. She told others she was really hurt by my actions. We haven’t spoken to each other since the incident.

My (21F) best friend (20F) didn't invite me to her birthday. Am I in the wrong?
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