I know a lot about packs, Scott. Because of you. Because you're my Alpha and you accepted me. We're a successful pack. A powerful one. We have taken out an entire Alpha pack, a Darach, we broke down an ancient evil spirit and we did this because we are strong and powerful. Because we are together.

And while you're right that Stiles would never turn his back on you. It is wearing him down. It's hurting him every time you and the other me hurt each other. Because he cares about both of us. And every time you hurt him, every time we hurt each other, the bond becomes weaker and your pack becomes weaker. No matter how hard Stiles is willing to fight for you.