Who’s in the wrong, me or my friend?

I had a really close friend who was like my sister for 5 years. I really trusted and loved her like family. In the past year before our friendship ended, we stopped talking as much. I think we were drifting apart. I tried reaching out to ask how she was and she would reply disinterested and slowly.

I asked her if everything is ok because she felt distant, and she said no it’s fine she’s just busy with life. But she said she was going away with her boyfriend and when she came back we would celebrate our birthdays together. But when she came back, she celebrated her birthday with her other friends, left my texts on unopened and didn’t acknowledge my birthday either. Our birthdays are a month apart and I bought her a present.

I felt she was ghosting me so I sent her a message to basically end our friendship. I said I wish her well and I’ll always care for her etc. she didn’t reply to that.

She is apparently blaming me for the demise of our friendship, saying I overreacted and that even though she knows she did hurt me it didn’t mean I should end our friendship. That I ended it over something stupid.

I reached out again a year later to ask how she is, because I’m not sure if I’m in the wrong or not. But she hasn’t even opened it.

Am I to blame for our friendship ending?

I’m in the wrong and should apologise
My friend is in the wrong
You’re both in the wrong
Other (see opinions)
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Updates
5 mo
We haven’t talked for a year but she said I was being immature to mutual friends. Do you agree? Could I have acted better?
Who’s in the wrong, me or my friend?
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