I want to exclude my friend's boyfriend.
What did his boyfriend think about this?
He is not the type of person who would become upset by me doing this.
Excluding people is not a very nice thing to do. People have the right to talk to whoever they want to talk to, and if you dont have a good reason for excluding them it will come across as immature.
It doesn't matter, I'm excluding him because I don't want him there.
It is rude to exclude people but understandable if you are hosting a limited event. It would be rude to ban one persons BF  if other people were allowed to invite theirs.