I feel awful but can't help it.

I'm engaged. Have a kid. And I have a crush on this guy who works with my fiance. Hes so cute and he pays attention to me. More than my fiance by a long shot.. He gives me this look like omg. But obviously I won't do anything with him. I'm with someone.. and I'll get over it eventually but it's so strong right now. Does this make me a bad person? Be honest. I won't get butthurt.. well.. I might but I'll get over it. edit::we dont have a set date. We got engaged after 2 years of being together and have been together for almost 7 years total.