Right, NicoleG - I can relate to that. The kind of destabilizing changes I couldn't deal with were huge, scary things my Aspie would never do, or at least certainly not without extensive prior consultation. With my ex, I didn't care so much about the material items themselves. What bothered me was that (a) I was rarely informed beforehand, and (b) every decision was on a whim. He could skillfully rationalize anything, but there was never a genuinely good reason to do, or undo, anything. Everything was subject to the trash bin, including people and friendships, which created a sense of tremendous uncertainty and instability. The only thing that drove him was immediate gratification. He couldn't stick with anything long enough to feel a sense of accomplishment. The end result is that nothing in his life has any meaning or significance. His answer to frustration is always the same: give up and smash it to tiny bits. He once got angry and sold my car, and left me without the resources to buy another. I came to think of him as one of those locust alien races, sucking a planet's resources dry before moving on to the next.
My Aspie is nothing like that! Nothing is more important to him than keeping the people in his life - because, unlike my ex, he has so much trouble developing relationships to begin with. He also has genuinely good reasons for his decisions, and if they will impact another person, he is considerate enough to ask before making them. Now, he changed his mind on me a couple of months ago, and it really messed me up. But he was aware of that, felt awful, and did the best he could to soften the impact. I doubt he'll let that happen again.
I don't mean to derail the thread, ILMA! I just thought, since we're on the topic of changing one's mind, my ex is a good example of a compulsive mind-changer, and how that can be so incredibly destructive.