Using my girlfriend

For the past several months I have have a girlfriend that I dont truly love and instead just use her to release my own desires for lust. I know it isnt right and every time I try leave her, I end of getting pulled back in by my desires. I know she loves me, and I know she thinks I love her just the same but I dont, I just use her. I been regreting it for weeks now, but I know if I leave her, I'll eventually go back. I have turned an innocent, happy, ignorant girl into a horny slut. I am so sorry of what I have done. I only wish that she would dump me and never take me back again, ever.