Hi, Alcoholfighter.
Sorry you've slipped, but good for you to come here and post.
Why? If only there was one and for all universal answer to this.
But there is absolutely no use in hating yourself - it won't add anything, it will only take away more.
You've made it to 32 days. Good.
When hangover fog clears out analyze what went wrong.
Did your overcome triggers? Did you think you can now have a drink or too? What else?
It's part of human nature to learn from our own mistakes, and the essential part here is to learn.
Move forward. Yesterday belongs to the past.
Today belongs to your new sober life. Make the best of it.
Best wishes to you.