These are familiar patterns seen all the time. The only thing that changes is the faces. Alcoholism works the same way with everyone even though one of the patterns is thinking we are unique.
Maybe a pattern you spotted, attending AA meetings and then drinking is something to be investigated. Where did you get the idea that going to meetings would keep you sober? The AA message is that developing a working relationship with a God of your understanding, through practicing and teaching the 12 steps will give you permanent sobriety. That is quite a different ball game to just going to meetings.
The meetings pattern is quite an interesting one. I call it saw tooth sobriety. If you picture the teeth on a saw blade, the peak is the end of a meeting, the best you are going to feel. Then it all starts to unravel until you hit the next meeting, which takes you to the next peak. From peak to trough and then back again. It gets tiring after a while so you miss a meeting or two, and descend further into the trough, life really begins to unravel and it's "God I needed a meeting tonight". But nothing changes. Not surprising so many flag it away after a time. Dependence on meetings just doesn't seem to bring the kind of freedom dependence on a higher power can bring.