For me, it came down to a choice: God or Porn. Ultimately, I decided that I wanted to be His without anything dirty there. It took a long time to get there, but truly, it is a choice. I'd seek godly help from an accountability partner, too. Ultimately, though, it was just God and me and I was watching the music video While I'm Waiting and I thought, you know what, God, while I'm waiting, I want purity to be mine. That was over 5 years ago. I chose Christ and I never looked back.
After the addiction is broken, you must take steps to protect yourself. For me, I had to get rid of all my VC Andrews books. There are spirits of things on dark items of this world. You must be willing to ask God to reveal the triggers of lust and addiction and remove them and NEVER LET THEM BACK IN. That is where most fail. They get rid of the trigger and then think they are "strong enough" later to bring them back. Never. They are gone forever. If it is a trigger, it's a trigger for a reason.