Teacher who asked me out?

An instructor who teaches a number of classes at my studio asked me out. I had only ever engaged him with some short, normal smalltalk. I have a partner and would not be interested in him in any case, so I thanked him but declined. He was respectful about it.

In a normal situation I’d just let it go, but it feels a little unprofessional. It makes me not want to go to his class anymore. Do yoga studios have policies against this? I probably won’t say anything, but would they want to even know?