If you're a good golfer she will probably like to come along. It's the curiosity to see what all the fanaticism is about.
It's no different than going to watch a hockey game where the boyfriend is a player is it?
If you're lousy at golf, she probably will want to join you next time instead of watching and participate as well. If you're good she will enjoy the round.
If you get married you can forget about having her come along and watch especially if you are a fanatic and golf in the rain.
These are the observations of an old timer who has been there and done that.
In my city on the muni courses you can't get on the course unless you pay green fees. Too many people sharing clubs.