I relapsed after 2 years, and I feel devastated

I’ve been completely free from porn for 2 years.
And today for some reason I relapsed. It didn’t happen suddenly, something triggered me and instead of stopping myself, I kept digging deeper and deeper into that hole until eventually I gave in.

Now I feel devastated and ashamed before Allah. I keep thinking about those 2 years and it feels like I threw all that progress away in one moment.

I’m posting this because I could really use some advice, encouragement or just a reminder from someone who has been through something similar.

For those of you who have relapsed after a long streak: how did you recover mentally and spiritually? What did you do differently afterward?

I don’t want this one failure to become an excuse to fall back into the habit. I’d appreciate any support/advice