A friend cancelling on me wouldn’t bother me at all unless they were consistently unreliable. Especially if they cancelled hours before the time we were supposed to meet. I would be annoyed if I took a shower, got all prettied up, or missed being able to go to a Zumba class because they cancelled last minute. But, annoyed would not last me two hours. I don’t even think of cancelling a date with a friend as change.
Change to me is moving to a new city, a death, divorce, new job, promotion at work, an illness, and other biggies. I deal with some big changes better than others. Obviously, mourning someone close to me would be devastating and difficult. Things like moving have become more difficult as I get older, but I still see it as an adventure and enjoy seeing new things in my new city and surrounding areas. New jobs and new positions at work I have always been able to take in stride pretty well. I have never been divorced, getting married was not a big change for me.