Your porn addiction is rather a consequence than a cause. The path you took, the path that could one day have been reversible, but now not, what pushed you on it? Is it your nature, weak nature? Is it women in your life that could sense it and push you further down the hill?

Oh well, regardless of cause, it is too late now, you went too far, no way back.
The rest of your journey is about realisation and Beta acceptance.