Thanks a lot, Hablablos, Peace and Theself! Your comments mean so much to me and helped me get back up after relapsing again for two days until yesterday, just thank you!
I know about the chaser effect and it just got me. It's a bad setting currently, as I've got lots of free time on holidays and am staying alone at home too much because it's cold and dark outside. This shouldn't be an excuse, but the relapse happened once again and I now realize how far I've come before as these strong cravings had become unknown to me. Well, they're back. You're right, a relapse never is a setback to 0 and my progress isn't totally gone, but it's a major setback though!
I did underestimate the cravings, but yesterday finally blocked internet access at my old computer with a random keyword I just threw away. This is rather extreme, but I remember William's words about those ready to quit and those who aren't. Mentally I am ready to quit for a long time now, but I still need behavioural changes to achieve a long term success. Otherwise I will relapse sooner or later.
When I read through my journal I've got the answer right there, as I already spotted my internet addiction as a big problem and I've got to add my cell phone addiction without a doubt. I used to take my cell phone to bed, to the kitchen, even to go to the toilet. I won't live free if porn is always one click away. Cell phone stays out of bedroom, out of bath, out of my kitchen. I proved that I can make it almost 4 months PMO-free despite my cell phone and internet addiction. If I can change this behaviour, there is light at the end of the tunnel.
Much love to each and everyone of you, thanks for helping me to get back up and all the best for you!