My guardian angel

Do it. Pull the trigger.
I listened to the voices in my head about to pull the trigger-
"Stop!"
I turn around and see a boy i never met before. But recognize somehow.
"Why?" I asked throughout my tears." I don't deserve to live."
"You do I know so. Cassie put down the gun."
"How do you know my name?"
"Because" he hesitates "I'm your guardian angel."

Cassie blames herself for everything when her parents died in the car crash when she was 7. 9 years later she had enough. But right when she's about to pull the trigger Wyatt her guardian angel shows up.