You love your fiance, otherwise they would not be your fiance right now. I think that you should just be friends with this other guy. AND DONT HAVE AN AFFAIR. stuff like that NEVER ends in a good way. If fate brought you and that other guy together...and you fall in love with him...then you cant hide that feeling. But right now you only said you liked him. I say stick to your fiance, he loves you a lot. He chose you and you said yes. If you thought about it, what would you do with out him?
Some people leave one person for another without thinking it through. And they realize that they made a huge mistake. Dont be one of those people, you have to search in your heart. what do YOU want and is it the BEST thing for YOU. I really hope I helped! ♥