Yeah, I can deal with people who don't respond to me, but not people who cancel all the time. I just wouldn't make plans with someone like that unless it was spontaneous, like she called me at 9 AM to have coffee at 9:30.

I also struggle with figuring out what is acceptable behavior from friends and family (and me) and what isn't. I think the trick really is just not taking it personally and not putting in more effort than the other person does.