[But when her expression changes, so does his- into horrified realization and then anger at himself.] Shit.
I- look, forget what I said. [There's the smallest chance it's going to work at all, but at least he has to try. He keeps forgetting she doesn't know, that even on that train he didn't actually tell her anything- because there's still that small part of his mind that thinks she should know it all, that of course she knows everything there is to know about him.]
What I meant is I know you don't want to be doin' any of this, and the only reason you do is you don't know how to stop it. Well, I'm sayin' I believe you can. If you'd slapped me just now, I woulda been okay. 'Side from the sting, of course.
[Please be distracted by that and completely ignore the part he said about himself. Please.]