No one ever should have that happen to them, but unfortunately it does happen, and more than probably we even know.
I'm going to ask the question that hasn't be asked yet, and I apologize before hand, but how sure are you that the person just decided to bail? Have you been able to determine that it's not a case of foul play? How much time has gone by since they were last seen?
Sorry about the questions, but when someone goes missing you do want to be sure.