[It's the fact that Derek doesn't say anything that has him feeling bad about it.]

Look, dude, I'm not saying you can't be there. You just... haven't been. So getting all uppity over it when Isaac's been relying on others--

It just doesn't make sense. If you want to be their alpha, then be their alpha. Don't just huff and puff at anyone that's actually being there for him. Because if that's how you guys werewolf, it sucks.