Unusual friend connection

For context, I grew up a super geek in Albuquerque, NM. At age 16 I discovered a new technology called a BBS, or Bulletin Board System, a predecessor to web based chat rooms. It was a direct modem dial chat and simple text game environment. This opened me up to a much wider social circle where I could nerd and geek out to my hearts desire with other people my age and adults that were also on the board. It was an excellent social environment, especially for someone like me who didn't fit easily into standard categories. I'm still friends with many of these people 22 years later, including having them as groomsmen in my wedding. My closest friends were a group of males of varying ages that had recently moved from Santa Fe to Albuquerque as three of the four were highschool chums that wanted a better job market post HS and the fourth was older, but had befriended the younger group through work. That older friend is Matt. He grew up in a small town in the mountains near Ft. Collins, CO, about an eight hour drive north of Albuquerque (500+ mi) but he hadn't lived there in nearly 8 years when I met him. Matt had an old friend that had become an Air Force pilot and periodically would fly down to Albuquerque from CO in a rented small plane when he was keeping his civilian license up to date. That friend is John. John had a long time girlfriend that would accompany him from CO, I don't remember her name. I met him a few times over the first few years of my friendship with Matt and the group of guys from Santa Fe, all still in Albuquerque. One day, during a big house party being held because John and his gf were in town, a female classmate walked into the house and expressed astonishment that I was there (I was just as astonished as her). This is Mimi. Mimi and I had been classmates for all of my education, starting in kindergarten and continuing through to that point in time in high school. Her sister was John's girlfriend. Friends I met through a computer chat room that were originally from out of state had an out of state friend bring his out of state girlfriend to a party where I discovered I had known her younger sister for 10+ years.