I'm not going to give my girlfriend a ride home
Why not give her a ride home?
Because I'm totally fed up with her.
Even if you are upset, you should still give her a ride home. It will compound the problem if you do not.
I don't care, I won't do it.
If you don't give her a ride home, it could damage the relationship. The way to not be fed up with her is to speak to her about problems. If she is still angry, it is hard to get over problems.