If I can't have her no one can

I close my eyes and all I see is this man with a knife and a mission to complete,
 if I can't have you no one will
he won't do it himself so he sends a messenger to complete his act
because if he can't have her no one will
a knife in the dark not too sharp but enough to cut
cut into her memory
if he can't have her no one can
shaking and scared she can't hide from what he left inside
no true injuries but a fear she won't ever forget
if he can't have her no one can
she wants to walk away from all she loves to protect them
because if he can't have her no one will
for once she was truly happy falling in love and now she just wants to step away because she knows if he can't have her no one can
all she wants is to be with the man she fell for, but won't because she can't let him get hurt or mixed up in her mess
because the old one won't stop and he will make sure if he can't have her no one can