@MassGuy, but you assume KB is PF’s fiancée. All we know is that they have a baby together and leave separately. We have no proof he is her fiancé. I suspect he is not.
It is true that normal people will do everything to help locate a missing person if it is their SO. What if it is an “ex”?
Same about “loved one”. What if they are not in love? What if PF does not know where KB is, but suspects something, and merely does not want to disclose too much personal information, in case she is alive? He could have said it all to the LE.
Not that I exonerate PF, I merely think we have zero information about the arrangement of that couple, if indeed they are a couple.