Please do not question yourself. You did nothing wrong. I probably would have done the same thing; although I would have waited one or couple more days to calm myself down and/or to see if I see any other alarming behavior. But I would have eventually done the same thing. What he did is not okay; besides it sounds like it might have triggered your past sexual abuse traumas.
May be you can look for another retail job right away? It is the shopping time of the year. It might be easier to find another retail job.
You are pretty resilient.