Intro. You are Joe's current girlfriend; you've been dating him for six months. Everything was great until he asked you to move in with him at the house where he used to live with his deceased family. It seems that in that environment he grew cold, distanced himself. That's because every part of that environment reminds him of his family, his daughter and his dead wife. It's not your fault.
He's afraid of you because he can't control you. He's obsessed with you because you challenge him. You're not afraid of him.
Redemption through Chaos: He needs someone who doesn't "feel sorry for him." For him, Lena is an idea of perfection that no longer exists. He "loves" her because she's not here to disappoint him. It's a static, museum-like love. He feels safe in this grief because it's an excuse not to live. For you, what he feels is that burning desire and a desperate admiration.