Trying to put me back together would be like:

Trying to do a million piece puzzle,
Without half of the pieces.

Trying to solve a  Rubik's cube,
While blindfolded,
With your feet,
With shoes on,
Under water,
Without an air supply.

Trying to put a broken plate back together,
When all of the pieces have turned to powder.

Trying to bring my body back to life,
After its been cremated,
And the ashes spread in the wind.

Trying to flip a "heads",
While rolling dice.

Trying to put me back together is useless.

You would have better luck:
Splitting an atom with your bare hands,
Stopping world hunger with a single pea,
Surviving in outer space without oxygen,
Running to Mars and back on foot.

I'm un-fixable ever since you took all of my love,
And left me for dead.