Undo Me: The Good Ol' Boys

I met her when I was sixteen. I fell in love with her when I was seventeen. She brought me to my knees when I was twenty. I loved her against reason.
 I loved her against hope.
 I loved her against all odds. 
Now she's back, a constant reminder of what I lost, what could have been.
 I hate her. 
 I resent her.
 I still love her. 
 Can I forgive her... Will she be my end once again or my beginning?