I'm upset that my girlfriend wont leave her car with me when she leaves to work on a yacht for 12 months
Why won't your girlfriend leave her car with you while she works on the yacht?
I don't think she trusts me, but she won't need it while she's gone.
I know your girlfriend will be gone for a year, but you shouldn't expect her to let you use that car for the entire time. The car belongs to her and she has the right to decide what will happen to it and who will use it.
I don't feel like I'm being selfish here.
I'm just saying at the end of the day it's her property and she can do with it what she wants. It's unfortunate that she doesn't trust you with it, but that's her decision.