Emotional Turmoil

So I’m engaged to a great guy who I love very very much. Our relation ship of 5.5 years isn’t perfect by any means, but I’m still happy with him.

So I just started a new job about a month ago, and a large part of my job is working closely with the marketing department, which is only a couple people. One of them is a guy close to my age, who I get along with very well. Over the last few weeks I’ve started to develop a crush on him.

I feel like such a terrible person for crushing on this guy, thinking about him, wondering if he’s thinking about me, being disappointed knowing he isn’t, because he has a girlfriend. I love my fiancé, and think about him too, but the other guy is still there in my thoughts. Am I a terrible person?