I liked the repetition quite alot - it's may be much more repetitive than most lyrics I've seen, but it seems to fit in this songs structure and feel....
as for the lyrics of this part:
"I want to turn and say goodbye
But, my heart...
I want to run, I want to fly
But, my heart..."
I understand you didn't like the "I want to run, I want to fly"... Do you want me to give specific ideas I have? or just do give my opinion on these lines?
As for the bridge, I think you could try rewriting it for a clearer meaning... but I think its really quite good this way as well, it both refreshes from the original structure, and gives you more info on what happens, while leaving most to imagination....
Good Luck!!!
Caladluin