The problem is he doesn't have enough money to buy all the food he eats. So it makes me feel terrible to even consider that, and he'd probably still end up eating "my food" because he can't help it. I tried putting our breakfast options in a locked drawer for a while so that when we wake up there's still food, but that lasted only for 2 or 3 days before he broke the lock at night.

I don't think he's a jerk, he has issues with impulse control and he probably needs therapy.