"...when I did PMO about a week ago I think I just needed to empty the tank. Maybe I was just horny." - NO, NO, NO, bloody hell NO man
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It was not your need to "empty the tank", it was not your horniness, it was not your libido...
it was your addictive brain asking for its fix. And you gave it to him. If it would have been just your need to "clean up the pipes", you would have done it without P, just like you did on days 12 and 72. I get the fact you don't want to make a big deal about it and it's great that you can move on with optimism and not fall into a binge, but please, don't minimize its impact either. You did allow yourself to relapse after a VERY GOOD string and you have to ask yourself why. How did it all start and how you ended up seeking porn. Think about it and then close that path. That's how it works man. You close, one by one, all the paths that lead to PMO use. You haven't undone your progress obviously, you've come a long way, but you have taken a big step back. There's no need to threaten yourself with doom when that happens, but moving on like nothing ever happened is not OK either. Analyze, analyze and then avoid. In your case, I would try to minimize time spent on social media, it seems to have a big impact on you, just like it did on me a few months back.
"...now I see porn for what it is: nothing. I don't need it anymore." Don't just say it, believe it ! And act on it !
I hope you take my words as they are meant, observations and a bit of constructive criticism. Be well and take care my friend !