Goodbye:

Goodbye seems wrong to say.
It's not a good bye at all, because "Good" doesn't go with a sinking feeling in your stomach, and a smile that covers a frown.
"Good" doesn't go with feeling like shit, and wondering if you're ever going to see a friend again.
"Good" doesn't go with saying words, and not feeling like they're enough, and having not one hug but two because you couldn't leave with just one, and regretting not having a third.
"Good"doesn't feel right when you're coming up with excuses for why you shouldn't feel bad.
"Good" doesn't remind you that Munich is $1,500 and 4,500 miles away, or that you should have made more time to hang out because now you don't have any.

Just "Bye" doesn't feel right either.
"Bye" feels hollow and fake, and mean, and empty.
"Bye" feels like I might see the person tomorrow, or in a few minutes.
"Bye" doesn't feel like saying a "goodbye" because no one in the history of "Goodbye's" has ever felt that "bye" was adequate to explain themselves.

Maybe "badbye" would be best... if that were a word.

Perhaps I mean to say a word that doesn't exist in order to express that I'm so sorry you have to leave, that it might be a while before I see you again, that I feel like my "Goodbye" was inadequate, and that even this goodbye is inadequate.

Perhaps it's just a failure of language.

Bye-lingual!
BI-cycle! (remember?)
Bye.
Badbye....

Goodbye.