I've made up my mind. I don't want my best friend's fiancee at my wedding
You don't like your best friend's fiancee?
He's made out with my girlfriend in the past
It's expected to not like people who made out with your gf in the past. It's your wedding and you should invite whomever you want there.
I think I won't invite him then, he really does make me uncomfortable.
I can understand why you'd feel uncomfortable seeing him at the wedding. If he made out with your girlfriend before your relationship, no one was doing anything wrong and you should let it go.