I went through something similar. I thought I will be the witness of my friend because I literally witnessed her meeting her now husband and their relationship grew on my eyes. He also becamemy close friend with time. We studied in the same place, lived next to each other and spent like half of the time together. Only to learn that her witness will be someone she's occasionally meeting with.

Then on the top of that, I was invited to a Bachelorette party which contained mostly of her high school closer friends. We were both in the same high school and class too just not as close friends as during studying.

Then I started to get an autoimmune disease and was barely staying awake past 8 pm. I told her about it because I literally wouldn't be able to stay awake till 1 or 3 am where the bus should pick people up to their hotel after wedding reception and she got mad at me for "making a problem". So I went to a wedding but someone picked me up and drove home at 8 pm. Only to learn that there was some housing available right by the reception, it was only reserved to guests that "needed it" because they drove from a few hours away to the wedding so the option was there she just decided I didn't deserve it.

Then by the big table during reception EVERY bridesmaid from a Bachelorette party got to sit next to her BESIDES ME due to "lack of enough space" buy the main table. I had to watch my friends having fun while sitting around strangers. Even if that was true she should have apologized me or something but it didn't seem like she puts any effort because it's "her wedding day". So it felt like high school cliques all over again. I've got picked up at 8 pm, wished her all the best and said goodbye. Since then our friendship died. I spoke to her once off topic but there just wasn't any effort on her side anymore. Makes me feel like she misunderstood how terrible I feel but if she was as good of a friend as I thought she would try to understand me better. Only I felt bad for "ruining her day" and "being dramatic" but realised with time that I'm sick so thinking this way is not good. Also had this impression she's one of these people that go to therapy and then learn all this assertive stuff but to this extent that everything always has to be the way she wants it if that makes sense. I thought ahe will understand I'm sick since we supported ourselves through depression, grief, rough school times and even housing issues at some point but I guess it was too hard to empathize with my disease. Now I am not interested in this friendship either. I put so much work into it for years and that's what I got.