Hancock

If you were watching the movie. You would have noticed at the begenning he said that he had woke up one and had these powers. They tied it together when she had mentioned they almost died before, and she had to disappear.

I think he understands that.

The point he's making is, according to the movie, when they get close together, they lose their powers. Yet, he's been living in the same place as her for an unknown but relatively long period of time compared to the length of the movie. Yet, in the beginning of the movie, he seems to be just fine, and at the end of the movie, they're in danger of dying because they've lost their powers.