Rey has very good reasons to distrust him. In spite of that, Ben's comment earns a brief, sharp look. He wants to ask, he really does, but it doesn't seem like the moment. Should she? He's had ample opportunity to hurt her and worse-- and he has, clearly-- but Rey--

He shakes his head. One thing at a time. Maybe he's wrong.

"She'll be able," he says, sounding decisive.

He's not decisive, he's looking for confirmation.