I think I know this feeling. It's a kind of shame for asking for something. It's from the past - THEM forgetting was their way of hoping to "get away with" not having to fulfill their promise to us. That's why the forgetting is so important - does it mean T REALLY didn't want to do it? Were you supposed to say, oh, that's OKAY, never mind! How many times did you have to say that in the past? That's why it's SO BIG here and now, even though, rationally, you understand?