You done the right thing and came back! I also picked up after 2 years of sobriety, same thing, I stopped being around others like me and boom I started to think I was cured.
You said "For me, now it's even harder to stop", isn't that the truth, just as hard if not harder to get back on track, but I am on day 3.
You can start over too, I know after 30 days you may think 1, 2, 3 days or a week isn't much, but it is the start to a better life.
This stuff is brutal but at least we can use it as a tool the next time we start to think were cured.