I quit porn very successfully. I used to PMO almost every single day, until about a year and a half ago, I saw a video that said that that the reason I don't have a girlfriend might be because of my porn addiction. And just like that, I decided I would never use porn again and, I quit, 100% cold turkey. I had never had a girlfriend before then, and I didn't understand why, so the moment I saw that video, I just KNEW I wouldn't watch any more porn. Quitting porn had revived my long lost hope of getting a girlfriend. Since then, I began to adopt disciplined habits and working on myself a lot more. I eventually met my wonderful girlfriend with whom I'm currently in a loving relationship.
I wish I could tell you I never relapsed, but that's not entirely true. I relapse twice, both within one week of each other. It happened during a rough period when my girlfriend started to unexpectedly and without explanation become very distant, and I, at the moment, mistakenly thought that she had lost interest in me and that the relationship was over. We ended up sorting out the problem (which was causing her to be distant), but I never told her about the relapses or my past porn addiction. Relapsing those two times was probably one of the worst decisions I've made, and I'll have to carry that burden for the rest of my relationship with her (a relationship that I hope lasts for my entire life, considering how wonderful she is). These relapses taught me that, no matter how bad things get, I should never EVER give up on my path to recovery.