How do I stop being attracted to my manager?

I've been attracted to my manager ever since I started working and I can't stop thinking about him. I'm scared that my attraction is obvious because he likes to smirk at me with a knowing look and I'm pretty sure I've always kept the best straight face I can whenever I'm dealing with him. Once, I even imagined him naked and gosh that made me so uncomfortable whenever he's around me. I'm scared one day my mouth might blurt out something inappropriate. He's not married and I'm not sure if he has a girlfriend so don't worry about that. How do I stop this? It's making me anxious whenever I need to go to work!
How do I stop being attracted to my manager?
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