Every couple of months or so, a friend of mine will drop me at short notice because she is double-booked, or just forget to get back to me about something. Now, I get that not everyone is super-organised and that this is part of who she is, but the thing that is starting to irritate me more and more is that she doesn't apologise. If the roles were reversed, I'd be super apologetic and offering to make it up in some way. I'm just wondering if someone could suggest why she doesn't apologise.