Here's my advice, take it or leave it...
Try the Love Dare on him (from the movie Fireproof), works best if he doesn't know you're doing it ;) and basically, if you want him to love you, then you have to fall in love with yourself. Don't make everything about him, find your own happiness in other things/hobbies, work out and be healthy, this helps in two ways, it will either make you more attractive to him and he'll take a second look, or if he continues to be a dud you will get self-confident enough to realize that you deserve better! If you do those things in addition to the Love Dare (and lots of prayer) then leave it in God's hands...
If I were you I'd give it about 3 months at least before you decide something big like leaving him...at least by then you'll know you've tried your best and you've given him such a pleasant few months that I can almost guarantee he'll probably regret letting you slip through his fingers eventually.
Good luck! You deserve someone who is head over heels for you, but it is not realistic to think that the butterflies in the stomach type of love will last forever...it takes work to maintain that kind of passion and excitement, a lot of work! Love is more about putting the other person first...but then again, if you're not even married yet and already the passion and excitement has worn off...I can guarantee marriage won't make that better...