So, a little backstory: 

   I'm in the last year of highschool and i had  a "desk mate" since 9th grade ( here we are 2 people at a desk ) but mine changed classes at the beginning of this year so i was alone at my desk.  
I have two classmates with whom i'm good friends with. They used to stay together since 5th grade but last year of HS decided to switch mates. Now after the first semester they asked me if i could stay with one of their mates cuz they want to sit together again. I do not want to do that since i actually like sitting alone and it won't be the same especially cuz my mate is like a brother to me and it will be different if i sit with anyone else. Plus i don't really have anything in common with this girl and I don't want to sit with her, but I won't sit with anyone else either. It's not really personal, I just like sitting alone, but not having things in common is a minus.  
So am I the asshole for not letting them sit together ?