....why are you involved at all? Whether your GF has a job/money is irrelevant. The bigger question is why your friend seems to think that you have a financial responsibility for someone else's mistake. Does your friend contribute to your car maintenance expenses because he gets rides in your car? Don't get me wrong, it's super sweet of you to help your GF out, but it's not something that you HAVE to do nor should it be something that you're EXPECTED to do. (which it sounds like). Do or don't do, but be clear on why you're doing it.

You drive a hard bargain! Unless your friend can find an exact match for the unpuked-on shoe, he's going to have to buy a pair. I wonder how your driving factored into the pukage. A further look into this matter could put you on the hook for much more.

It’s not impossible to clean shoes, right? He doesn’t need to buy new ones. This could easily and cheaply remedied by offering to clean the shoes

dude that's fuckin hilarious

How much was the cleaning of your car?

He had to buy new shoes because they were puked on?😮 How about washing them?🤔