I insist my fiance's bachelor party be alcohol-free
Why won't you allow him to drink with his friends?
Because he will more likely cheat if he is drunk with friends.
You shouldn't enforce restrictions on a partner at a special event meant for them. They'll feel as if you're not allowing them to have fun with their friends. He could end up feeling resentful if you tell him how to have fun.
He is not going to have fun with his friends, I'm making sure of that.
Do you think it's right to be controlling? What if he was telling you what to do all the time? This is not a good way to start a marriage.