Every breath counts

Once upon a time,
there was a heart,
So disturbed by truth,
It was most certain,
One day it would desiccate and die.

Deep in the hollows,
hidden by shadows,
This ole heart would thump.

It's host was never a party,
saddened by the sulking,
realizations brought to view.

Until one day,
this heart attacked...
Sending this host for a loop!

This heart decided,
it was staying alive,
Be it with this host,
or a host that's new.