How can I predict sustainability?

I made two attempts to quit in the past. The first I tried during high school only lasted 8ish months. My second in 2016 about 6ish months. Now, I haven't gone back since February and this is my longest stoppage since 2016. How can I tell if I can hold myself back for real this time?

 

I may be on another one right now. Just wish I could keep it going without a burning desire building up.

 

I quit soda/ energy drinks in 2017. It was my second ever attempt but had zero serious urges and only one minor urge to go back. I easily justified why I shouldn't do it and have had no urges to drink soda. Smelling soda is kind of nostalgic, but doesn't trigger me. The problem is I WANT porn to be that easy to stop.

 

My prediction- most likely in the distant future when I finally tell my therapist and let the guilt was the fires away.
My dentist unintentionally guilted me out of sodas and energy drinks after I confessed into drinking monster energy drinks (omitting it hadn't even been a year). So it could be the same for pornography?