Crush on a customer

Okay, so I don't exactly have any real questions or anything, but I just needed to get this out of my system. So, I work at a dog kennel (boarding and daycare), and I have recently found myself to be developing a crush on one of our regular daycare customers (the owner, not the dog). It is such a pain, and I don't know how to deal with it. I discovered during an impromptu Facebook stalk that he's 20, so just 3 years older than I. I'm worried that one of my coworkers will catch on somehow, especially considering they are all females. I am really good at hiding my feelings, but I am still paranoid that they might start to suspect something...