This poem has pretty much sealed the deal... I'm afraid. If you had no intention of getting her back, you don't have to worry about her bothering your now.
The poem was far too morbid, hinted at insults, and only offered validation for her reasons to not return to you.
The last thing you want to do when trying to encourage an ex to give you a second chance is express all the negativity that you feel...
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen