<human>: Can you give me the gist of the text in a nutshell?

Backstory: I have a close group of friends, there's around 8 of us. Now during lunch in school we all sit together, and some other people will come and join us. So there's our lunch group and then the group within that group (me and my 7 friends). Now when we hang out outside of school it's just the 8 of us, not the extras that join in during lunch. 

Story: Tonight I received a text from my friend asking why we never include more people into our group when we hang out. She said stuff like "Do you feel no remorse when not inviting them? Some have invited you to their things every now and then, but you never invite them to your group when you hang out outside of school". 

Problem: I just want to somehow tell her we like how our group is now, a close group of us 8 friends. I would like to be able to tell her this without sounding like a dick or some jerk. I just have no clue on how to word this right and just tell her we just like our group how it is and don't want to change it.
<bot>: Don't know how to tell someone that My group likes how we are now and don't want to change how it is.