that really stinks :( but as someone who drives their friends places a lot (only one with a license), I never mind as long as I feel like my friends appreciate the favor and don't take my help for granted! Even if he's not doing anything else, he might be starting to feel like you're taking advantage of him. I think just a simple gesture like baking him cookies or even just getting him a giftcard to say thanks would cheer him up a lot!