I'm not going to allow my fiance's wedding guests to bring a +1
Why don't you want them to bring someone?
I decided to invite only the people who mean alot to me.
It is your wedding, so you can do whatever you want. The point of this day is for the focus to be on you and your new wife, so it's fine to not include people you don't know. You don't want your wedding to be ruined by catering to people and not yourself.
Shut your mouth. I'm going to hurt you.
Why are you being so hostile when I'm agreeing with you? You shouldn't tell people you are going to hurt them.