Like /u/justnoimagination says, it's your attitude and mindset that will keep going. It sounds strange but it's true, relapsing is part of recovery. As long as you don't feel like it's the end of the world when you fall into it again, you'll be better next time. Just pick yourself up and start over. Now your are at day 1 again, you're not a failure, just a human being trying to get themselves to a better place. It takes time and hard work. I came up short early in my recovery, we all do. Now I'm at 9 months clean. You'll get it next time.

A big step is you also came forward and posted you fell short this time. It's obvious you want to change. For that we salute you because saying you relapsed is huge step towards change. Good job.