I think that I am infatuated with my boss. I get so distracted by him--what can I do to not get distracted?

I work in an industry that is dominated by men so I am use to them. But there is this one guy that really distracts me and unfortunately he is my boss. I think about him constantly, I fantasize about him, and I get so nervous around him and I can't seem to function when he is in the room. What should I do besides try to ignore it? He's married with a young daughter. I don't intend to do anything physically or emotionally but what can I tell myself to stop thinking about him and letting him get to me like that.