Very well written, also very sad. I love the lines:
"That last kiss you gave to me still lingers on my lips
Untainted by any others
Without you i lose my grips"
But also, it's good that you regret what you've done in the past to hurt this girl. Just try not to let the guilt take hold of your life, find things that you're happy about, and embrace:) Besides, we all learn from the mistakes me make.