What happened in my case: I had 5 good friends in university. I invited the 5 of them to start a cooking club.
There were a number 6 and 7 that were hanging on the fringes of the group, and that I didn't like interacting with. So, I started the idea, invited 1-5. Nr. 4 decided to invite 6 and 7.
When I told her that I would have none of that, that it was *my* cooking club and that I invited exactly as many people as I wanted to, the group fell apart. The first meeting of cooking club was never held.