You try to remember how it was when you said bye the last time. You suddenly remember that how you did not feel anything till after a week when the feeling sank in and then you felt asphyxiated by it. You had then wished that why did this feeling not come when i was around those who I wished adieu without feelings.
As they say "be careful what you wish for, for you might just be granted your wish". This time the feeling sinks in when you are about to part. You realise the part each and everyone plays in your life , suddenly. You know that you are going to remember the people when you hear songs that are automatically associated to each of them individually by your unconsciousness. Then you won't be able to hear those songs for few days and eventually would not be bored by those songs even when played in loop for the whole day.
These thoughts could never ever be described and they try to blow you up from inside. your body resists blowing up with your throat feeling the pressure lump, but your eyes give in and the tears leak out. Then you begin to part and you are worried because you don't know what you are going to do as the last thing between you and your friends.
Suddenly the word comes to your rescue naturally. It eases the pain and makes your parting just another among the infinite partings in the universe's time and space. Bye and a wave of hand. It's so cliched yet so apt.
A hug , a "bye" and a wave!