Hannah comes home to a completely different life, and she has to get used to it. The fact she can't have her soul mate hurts on a level that sometimes takes away her will to want to wake up the next day. Because she’s been gone so long, she guesses there's a good chance that she’s lost him, she just didn't realize how much it would hurt to move on without him.
Cullen had waited for Hannah to get home. They never intended for her to be gone so long, and now he needs to know why. When he lets his hurt feelings get in the way, it almost takes her from him again. He knows he’ll do whatever it takes to get her back and to keep her in his life for good.