I'm going to refuse to go out with my girlfriend even though she would have paid
Why don't you want to go out with your girlfriend?
I don't see any good reason for me to do that. Life's too short to be messed up with meaningless things like that.
I bet that she was really looking forward to going. You should just go anyways because you know that it will make her happy.
Why should I? I don't see the point. I'll stay home, watch Netflix and chill
You should ask her if she wants to stay home and watch Netflix with you. It's nice to relax at home together with your partner, so she might be interested.