D112y I totally sympathize with your experience and story.
I struggled many times with the "resetting" of my sobriety date after having "just one".
It's really incredible what lengths we'll go to in order to validate our slip-ups and try to brush them under the rug and make it seem like they didn't happen.
It's OK to stumble and fall down.
If you learn from this experience and use it as a positive reminder that you ARE strong enough to say NO (to anyone, anywhere, no matter what) because your sobriety is the most important thing....then it's a worthwhile lesson!