Is it really horrible of me to think of this or fantasize about it? How can I STOP doing it?

You and I are kind of in the same situation... I live with my boyfriend but because of our work schedules we don't see eachother as much and with my new job I have been spending a lot of time with a guy friend at work... and I want him! I can't stop thinking about him and I just want to kiss him and i feel like he feels the same way too!! But he knows I have a boyfriend so he doesn't do anything about it and neither do I but I want to so badly!! I find myself daydreaming about him more than I think about my own boyfriend and then I feel bad. Maybe it's a common thing. Maybe it's normal... maybe some people get through it when nothing happens and others cheat and ruin their relationships over it. I guess you just decide which one you want to be and that is hard to decide with theeeee feeelingssss you are having..... i know!!!!