I don't know that there was supposed to be any deep motive on Michael's part here. I think he was just having a little fun telling her some semi-scary stories, just like any boyfriend might do. Or maybe he was just gauging her reaction to make sure she wouldn't run away from him.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.