So then, you have to flip the question into: "What could be a way to prevent this?"

You can view the main principles of maintaining longterm abstaining in 2 elements. A base, the mindset you should have every day, and the remedies for the moments of emergency, when you're dealing with a strong urge or already in the act of relapsing, while still having the ability to stop.

1: An amount of faith or confidence matters much for consistently keeping nofap lifelong. Compare that to having small worries often, those act as excuses to break the streak, because then you can temporarily escape the difficulty of nofap.

With a strong belief that you can do nofap and it will help, those relapse-triggering worries have way less chance, and instead it has a mentally strengthening effect.

It is very trivial, but therefore easily forgotten or downplayed. But it definitely has a significant effect that you can also observe in the placebo medicines that don't have the actual medicine.

A way to get a boost of that is to look at inspiring examples of others who succeeded in abstaining and got results. My favorite example is the one from the monk Swami Vivekananda after his 12 year period of abstaining.

An example of remedies for nofap struggles including near relapse moments.

2: In the mode of searching, you're very motivated, difficult to stop. Also when having found a result it's addictive to search for more, because there might be more important results, or because it's better to have more different to compare.
So then, you have to flip the question into: "What could be a way to prevent this?"

Don't get me wrong, whether those examples of the first element are scientifically true, the goal is of building up a stockpile of confidence to make the whole lifelong nofap-implementation go more smoothly.