I've been fighting this battle for many years, and although its taken a significant amount of time with many falls along the way, I've become more 'aware' of triggers and thought patterns.
I've also been in therapy for the past couple of months, which has been invaluable. It's helped me to identify thoughts (cognitive behaviour) as a response to certain areas of my life that cause me anxiety/fear, or other negative emotions.
In short, more often than not I'm not merely 'struggling' with porn as I once had been, but now able to focus on the cause and effect of desire, emotions (that may trigger a need for porn), and the ability to be resilient after a fall.
The most important lesson that I've learnt from this experience is that determination is not enough; what is needed is consistency. It's not simply about not acting out for 90 days, but rather to re wire the brain to:
1) familiarise it in preparation for NOT looking at porn and guarding my eyes,
2) accustomed thoughts and associations to other priorities and values, e.g. Visualisation (e.g. Imagining being strong amidst a moment of desire, and consequently not watching porn or acting out),
3) thinking seriously about consequences.
I highly recommend therapy for anyone that has struggled with such problems for a long time. Trust me, I am a very self aware person and very determined, but since deciding to seek professional help it has helped me to BELIEVE in the possibility that I can break free and recover from this burden, one that has real consequences.
It takes time. It's a process and requires hard work. But ultimately we're stronger than we think we are and can learn to be true to ourselves and fight hard everyday for what will make us a better person.