While I agree it was beyond dumb that she blurted out the "secret", I also think that everyone is being overly harsh on her. Can anyone honestly say that they've never let something slip that hurt someone else? I do agree that the LW should do her best to try and patch the problem and maybe consider whether or not she wants to be in a relationship with someone who has a very different view of marriage. But her utterance is forgivable, although the friend may not forgive, since malice wasn't intended.