I'm going to refuse to drive my girlfriend to the airport. But I think I got a good reason.
Why would you refuse to drive your gf?
I think the relationship is not working for me anymore, so I want to stop it.
I get your point, but you should be helpful towards your girlfriend no matter what. Partners are expected to help one another.
Is that a law? I don't feel like helping her right now.
If you want to end the relationship you can sit down and talk to her on a later date but you are still together now and she needs help getting to the airport so you should be there for her and make sure she gets there.