In the retail world things tend to get a bit hectic. There is a huge possibility that they were busy and didnt get around to it. When I left the interview for my current job they said they'd call the next day. Guess what? The next day came and I received no phone call, but about a week later the manager called and said she didn't forget about me and asked if I could come in the next day for training. I would definitely go to your other job interviews just in case you didnt get the job.
Dont think negative and let us know how it works out. GL
