How can I just stop being attracted to this man?

I am utterly infatuated with this man and I try so hard all day to not think about him and even try to think "I hate you" just so I won't like him anymore. He is married with a baby on the way and I know there is no chance we could ever be together, I would never want to break up someone's family, and I am married on top of it. I try to think about my husband all day and how much I love our family. But everytime I see this man, I can't help but think he is the most amazing man I have ever met. He is always just really nice and I love everything about him. HELP how can I get over this obsession!! I am sick of it!!