Goodbye is a strange word. Its a word I use everyday and there is so little meaning attached to it. I always say goodbye with the expectation of seeing the person again. Maybe not today, not tomorrow but sometime in future. There is never much thought attached to when that "again" will happen.
Its probably better that way. The concept of saying goodbye to someone expecting never to see them again is alien to me. You might tell me that one never gets disappointed that way. But, I can say the same for my current stratergy. What joy can come out of dwelling into the percentages or probablities of meeting again? I believe its always more than 0 and lets leave it at that!