<human>: So this is my first time posting on here so sorry for messing anything up/my shoddy story telling.

Recently (last 12 months) I [24F] moved to another city to pursue postgraduate education. Since moving my best friend [22F] has been creating drama ever since I left my home city (stories for another day) The latest in this draining saga is based on my suggestion of going on a holiday next August after I finish my course to celebrate graduating. Bf was all up for this then messaged a few days later saying can her friend come. I don't know her friend and say no as after a holiday last year with mates and people we didn't know too well I don't want a repeat of that.

Anyway fast forward to today and she messages me again saying shes been talking to her friend and she wants to come away with us and I should be fair because she came on holiday with me and two of my friends she didn't know last year (we were in a bigger group of 9 and I only knew two of them) and that her and her friend are looking at June July instead of August (I chose August as my last placement finishes then). 

Am I wrong to be annoyed because my plans to celebrate completing two degrees has been taken over and ruined by someone who is supposed to be my best friend and someone I don't even know?

Can you condense the text into three sentences or less?
<bot>: best friend stole my plan and is trying to make me feel bad because I don't want to go away with someone I don't know and insists on completely changing my plans