Stuck Between Two

I am stuck between two.
The apple to my eye and the tree that bares life.
I cannot please both, without displeasing myself.
So I will fall with the apple of my eye.
And rot with him in the scorching sun.
Until his deep red turns into brown.
And the brown turns into bark.
And the bark turns into a leaf.
And the leaf turns into a apple.
Then once again I will be stuck between two.
And then, once again I will fall for the apple of my eye.