My FP is a childhood friend with whom I've reconnected 12 or so years ago and ever since we've been truly best friends. She is my age, but lives abroad, in a different country than mine.  
We maintain close contact through every day skype calls, whatsapp, facebook etc, and whenever possible we meet here or there at least once a year, which sadly didn't happen in 2020, because of Corona...  


She works from home for a while now and that at least provides more time to talk than before, when we were both busy with work schedules and real life interruptions.  
She has 2 female colleagues that started getting closer via going out for drinks or having house parties from time to time though the 2 years they know each other, so she is happy that she has someone to go out with and socialize in person there. I'm happy about her too, except...

Recently they seem to have become even closer and she often invites them for drinks at home (because the bars are closed now), and in fact, yesterday she told me she has yet again invited them to come tomorrow (today now). But not just that - they also went hiking yesterday, so two days in a row with them, pretty much all day long. When she returned she called me and started posting their pictures, all the time being more focused on the upload process than our conversation.

So last night, after a stream of circumstances in my life, which had me already feeling vulnerable and low in the first place, I had a slight breakdown, when I opened my facebook newsfeed and saw that not only has she uploaded all pictures but also yet again has changed her facebook profile picture with one of the 3 of them.   
This is not the first time she has done this - I have confronted her about that before, but she claims it is just because she likes how she looks on the said picture and because she likes to put more recent pics, as opposed to our last picture together being from 2019...

  
I know it sounds petty, but she never decides to put a profile pic with me on it, only if I have sulked about it and she keeps it for just a few weeks before changing it, whereas with them - the profile pic remains for months and months...  


Anyway, back to why I freaked out. After the initial stab of pain in my stomach from seeing the profile picture, a little later I opened the app again and.... saw that she has edited the picture post with "me and my sisters together, so blissful". I had angry tears in my eyes. I know she has other friends and acquaintances in her life - some closer, some not so much, but I thought only I have earned the title of sister, beside her biological one, because what we share is a whole different level of just friendship.   
But no...at this moment I felt like it didn't mean as much to her as it does to me, because apparently just about any rando can be called sister.  


And the cherry on top today. I open my facebook again and see she has tagged them in a meme of 3 retro ladies having coffee, and wrote: "girls, this would have been us if we lived 120 years ago".  
I know it's ok to do such things, but what stings extra is - she almost never or very rarely even thinks of tagging me on a random meme like that, and when i post something on her wall, she doesn't even acknowledge it - I have to specifically tell her I posted something, in order for her to pay attention at it.  


Now don't get me wrong, I appreciate her but I can't help feeling hurt and I feel like nobody would understand why - most people would think I'm crazy or petty for reacting about such things.  


Can anyone relate and give me some word of comfort? Please no harsh comments, I can't take it now!