I have been a trailing spouse for 23 years. I don’t have friends as such in my day to day life. Only aquintences. People come and go constantly in this lifestyle. Some keep in touch some don’t. Those that keep in touch I can count on my one hand.It sounds to me that you have lived in the same area, so it is easier to keep these friendships. I grew up in a small town and after high school 95% of the kids moved away for study and jobs, and not just to the nearest city. I moved to a city and then the job I had took me to other places where I meet my husband, so then moved to be with him. Then we had to move across the country for another job and leave our friends again. So I don't have any real friends remaining from school, or early work days. But have made new good friends in each place we have moved. I still keep in contact with an old flatmate from my teens/twenties but she is probably the exception, and it's only about once a year. It is very hard to maintain friendships over distance, and once I become the only one who makes contact, I let the friendship go. People do move on.
Our year group from school do keep in touch via our 30 year reunion WhatsApp group, we are all over the world. We keep each other up to date on births, deaths and celebrations.
I have one friend from uni. We keep in touch often and meet up when I’m in town.
My two best friends have been with me for over 25 years. one I met through friends while studying and the other was a colleague of my husbands. We now all live in different countries but talk almost daily. They are the two I can count on.