Farting incident with a guy?

Now this is actually serious, not for a laugh. I've started going out with this guy I like. Yesturday, we were walking home together. It went quiet for a while, and then suddenly he lets out this big fart. He said 'sorry about that'. But then I said 'don't worry I'll top that next time after a burrito with side beans', obviously I was joking. But he looked away and didn't say nothing. When we got to my place he smiles and says goodbye. Is he creeped out by what I said? Will he leave me? Thanks.