Ziva said goodbye as she stepped away from the plane Tony Gibbs and Vance were on. She was going back to mossad for good. Tony acted fine in the plane and act work but when he got to his apartment and saw the picture of Ziva he started to cry.

My old friend, I recall
The times we had are hanging on my wall
I wouldn't trade them for gold
Cause they laught and they cry me and
somehow sanctify me
And they're woven in the stories I have told
And tell again

Tony rembered all the memories good and bad of their relationship from the first time they ment to the time the plane door shut. If only he could go back and apoliges maybe she would come back. If he could go back in time and erase what happend then she would still be here and everything would be normal. He wanted so bad to beable to tell her face to face that he was sorry.

My old friend I apologize
For the years that have passed since the
last time you and I
Dusted off those memories
But the runnin' and the races and the
people and the places
there was always somewhere else i had to be
And time gets thin my old friend

Ziva was right he could have just walked away when micheal was stapped but no stupid stupid tony had to shot him. He just had to and know he lost his partner and his best friend.

Don't know why, don't know why
Don't know why, don't know why

Tony needed to wright her a note and try to get her to come back. Wright her song or something. Show her he did care. He now knew she was really in love and he took it away from her. Just because of his mistakes he may never see her ever again.

My old friend this song's for you
Cause a few simple verses was the least that I could do
To tell the world that you were here
'Cause the love and the laughter will live on long after
All of the sadness and the tears
We'll meet again my old friend

All that was left for him to say to her was goodbye.

Goodbye, Goodbye

He started to gently cry

Goodbye, Goodbye

My old friend