Although not quite the situation here, I have been asked back afterwards after I have failed an audition. My group before last I went to an audition, they got back to me with 'you were fine but this other guy was better for what we were looking for', which is obviously fine, that is the point of an audition, so i replied with ok, thanks, hope it all goes well. I even went to see them after that, and he was clearly better than me. A couple of months later they got back in touch to see if I was interested because he had disappeared - like completely disappeared, he didn't turn up for a gig and they never heard from him again, no falling out or disagreements or anything.