What made you fall in love with him in the first place? If something hadchanged, talk it over. If you still feel you aren't in love with him, tell him. Marrying him will make him happy in the beginning, but you won'tbe happy, he'll pick up on it, n start wondering where he went wrong not realizing it wasn't anything he did or didn't do, but in fact it was something you failed to say BEFORE "I do".

First off lets find out what do you define as being " in love" ?
Every person has their own definition. Is it feeling strong intoxicating emotions that choke your heart in the middle of the beat? Is it having such strong sexual attraction that you can't wait to get home to rip his clothes off? Is it desire to have his babies and play house?
I have my own definition of what being " in love" feels like to me and I can tell you that from my POV that " in love" feeling comes up constantly when it is mostly infatuation in early stages.
The real love to me shows up in form of building something together , a family, a home, memories without arguments and anguish, caring enough for your partner to want to jump out of bed in the morning and bring him a cup of coffee in bed, or when your partner finds you beautiful and wonderful no matter what you look like, when you really on each other for the support that no one else can give you, when your partner can feel what you are thinking.. Etc
Sometimes I would get that " in love " feeling with that person, but desire to be with him is consistent no matter what.
The giddy and cutesy stuff is pretty much hormones shooting into the brain and these types of relationships most often crash and burn from what I know.

I agree that the giddy stuff doesn't last forever but we never even really had that. we started out as good friends and it let into more. I think real love is more than just the giddy stuff, but lately, I haven't even wanted to spend time with my fiance

How long have you been together? Maybe its just a phase your going through. Maybe if your wedding is in the near future its just the jitters. If your not feeling like you even want to be around your fiance ,maybe you should reconsider getting married. Try thinking about what things made you fall in love to begin with and determine if they still exist...
I was married for five years and realize now (and for some time now) that I never really was in love with him. Only in love with what I wanted all of it to be but never was. (if that makes any sense)
Good luck

What was the spark between the two of you that you fell in love with? Was it physical, emotional, friendship, support, sexual? It's best to examine what you're feeling closely and maybe talk it out with a professional before you take the marriage step. Marriage is supposed to be forever... and the honeymoon phase sometimes ends pretty quickly after the IDO's are said. Folks let their real personalities shine thru then. Maybe start a journal about what you want out of life and see if it is compatible with what he wants. Just a thought. Don't go thru with it if your having doubts now.

Did you guys have an argument recently ?

Well you can't stay in something just because you feel like not breaking his heart. You have to be honest with yourself and him. It's only fair to him.